Xiaomi 17 Ultra Review: Hardware Perfection, Software Frustration

The Xiaomi 17 Ultra sits at the top of Xiaomi's current lineup, above the compact Xiaomi 17, and it makes its priorities obvious from the moment you pick it up: this is Xiaomi's most camera-obsessed phone, wrapped around a genuinely large sensor array that PhoneArena summed up as "hardware perfection, software frustration" — a framing that holds up well across independent testing. GSMArena's own comparison against the Samsung Galaxy S26 Ultra is unusually direct for a review, calling the 17 Ultra "more 'Ultra' than the Samsung," citing a more versatile camera setup and a real battery-life and charging advantage — a bold claim, but one the hardware specifics broadly back up, even before weighing the software trade-offs covered later in this review.

Design and Build

This is the first Xiaomi Ultra with a flat display rather than curved edges, at 8.29mm thick and made from aluminium alloy with composite fibreglass. The camera bump is, by multiple reviewers' own description, genuinely large — Mark Ellis Reviews called it "utterly worth the extra heft" once you adjust to it, but was upfront that buyers coming from phones with smaller camera modules should expect a real adjustment period. 91Mobiles noted Xiaomi has actually trimmed weight from 226g to 218g and thickness from 9.35mm to 8.29mm versus the Xiaomi 15 Ultra despite the larger 6,000mAh battery — a genuine engineering improvement, even if the phone still reads as substantial in hand. Colour options are more restrained than some rivals, running to Black, White, and Silver globally — the China-market Leica edition adds its own dual-tone finish with a mechanical zoom ring around the camera island, a hardware feature and design language that hasn't made the jump to the global model reviewed here.

Build quality extends to a genuinely comprehensive protection rating — IP68 dust and water resistance is standard, and Xiaomi's own materials note additional IP69 certification against high-pressure, high-temperature water jets, a spec still uncommon outside a handful of flagships. Connectivity is equally thorough: Wi-Fi 7, an infrared port for controlling other devices, and two-way satellite communication for messaging outside normal signal coverage are all present, alongside an in-display ultrasonic fingerprint scanner and stereo speakers with Hi-Res audio certification. NotebookCheck's pros list independently confirms the speaker quality specifically, rating it "good stereo sound" alongside "high-quality appearance" among the phone's clearest strengths.

Display

A 6.9-inch flat LTPO OLED panel, up from 6.73 inches on the previous generation, runs at up to 3,500 nits marketed peak brightness with 1–120Hz adaptive refresh and HDR10+/Dolby Vision support. Independent testing backs the marketed figure up rather than undercutting it — NotebookCheck's own lab measurement recorded 3,645 nits in auto-brightness mode, a genuinely class-leading result rather than an inflated spec-sheet number. The panel also uses Xiaomi's new HyperRGB subpixel layout rather than a traditional PenTile arrangement, a real technical change Xiaomi says delivers sharper apparent resolution at the same pixel density — independent testing broadly supports that the panel looks noticeably crisper than the raw pixel count alone would suggest. 91Mobiles specifically praised how the panel pairs with HyperOS's fluid animations for a genuinely smooth, buttery feel — a strength across the whole display experience, not just raw specs.

Camera

Three lenses make up the Leica-branded system: a 50MP, 1-inch main sensor at 23mm (the new Light Fusion 1050L, replacing the previous generation's Sony sensor), a 50MP 14mm ultrawide, and a 200MP telephoto with continuous optical zoom spanning 75–100mm — a genuinely more sophisticated zoom mechanism than most rivals' fixed-focal-length periscopes. This is also a deliberate consolidation from the Xiaomi 15 Ultra's quad-camera, dual-telephoto setup: rather than two separate telephoto lenses covering different fixed ranges, the 17 Ultra's single continuous-zoom lens covers both old focal lengths and everything between them, trading total lens count for a smoother, more flexible zoom experience. That trade isn't entirely free, though, and it's worth naming directly: GSMArena flags that the telephoto gives up close-focusing ability in exchange for its extra reach and resolution, a genuine compromise for anyone who wants to shoot macro-style shots at 3x-4x rather than distant subjects, and worth knowing before assuming a continuous-zoom lens means no trade-offs anywhere across its range.

Independent testing backs up the hype on stills: DxOMark scored the camera system 166 points, a strong result, though notably not enough to claim the top overall spot in DxOMark's rankings — the iPhone 17 Pro was specifically flagged as still ahead in that comparison, a genuine, honest limit on an otherwise excellent system rather than an outright win across every benchmark. Video is where the picture is more mixed, and it's worth being direct about it rather than glossing over: it's the single clearest, most consistently flagged weak point across reviews, with GSMArena's global review naming it the one thing keeping the phone from a perfect score, and the China-market Leica edition review going further still, describing stabilisation specifically as subpar and overall video quality as merely alright rather than class-leading. Notebookcheck's independent testing largely echoes this: the three rear cameras produce great dynamic range and accurate colour in video, but sharpness across all three lenses lands a notch below the very best in class — not bad footage by any means, just not spectacular next to the still-photography results. Video otherwise tops out at 8K30 on all three rear cameras, with 4K available up to 120fps on the main and telephoto lenses (60fps on the ultrawide) and Dolby Vision capture across every resolution except 8K.

Performance

Snapdragon 8 Elite Gen 5 on a 3nm process, with 12 or 16GB of RAM and up to 1TB of storage, delivers exactly the flagship-tier performance the price implies — Geekbench scores land around 3,700 single-core and over 11,000 multi-core when cooled, comfortably ahead of most rivals. Worth an honest, direct caveat on sustained load, though, since the Snapdragon 8 Elite Gen 5 itself has a well-documented thermal reputation this generation: NotebookCheck's independent testing found roughly 30% throttling in 3DMark's GPU stress tests, and lists "high waste heat & SoC throttling" directly among the phone's cons. CPU performance holds up considerably better under sustained load than the GPU does — NotebookCheck measured only around a 10% drop in Geekbench scores after a 15-minute burnout test, still comfortably ahead of rivals like the Galaxy S25 Ultra even in that throttled state. The honest picture: this genuinely does throttle under extended heavy load, same as every phone running this generation's Qualcomm flagship chip, but the 17 Ultra's throttling is comparatively moderate rather than severe next to other Snapdragon 8 Elite Gen 5 phones tested the same way.

Software

This is where the reviews turn notably less kind. PhoneArena's own headline — "hardware perfection, software frustration" — captures a consistent thread across independent coverage: Beebom Gadgets specifically called out adware in the software and said the UI "needs a little more polish," echoing the same HyperOS bloatware criticism that's followed Xiaomi's phones across generations. HyperOS 3 runs on Android 16, and the underlying update commitment is reasonable for the category even if it isn't class-leading — a real, if unglamorous, counterweight to the ongoing software-polish criticism levied at HyperOS generation after generation. NotebookCheck's own review noted an inconsistency worth flagging directly, too: colour reproduction from the cameras isn't always optimal, which sits at odds with the otherwise glowing hardware praise and suggests some of Xiaomi's processing pipeline hasn't caught up with the sensor quality underneath it. It's not a dealbreaker for most reviewers, but it's a real, repeated complaint rather than an isolated gripe, and one worth weighing seriously against the otherwise excellent hardware story told elsewhere in this review.

Battery and Charging

The global model carries a 6,000mAh battery — smaller than the 6,800mAh Chinese-market unit, but still a genuine, meaningful upgrade over the Xiaomi 15 Ultra's 5,410mAh cell. Xiaomi's decision to hold back the larger cell for the domestic market is a real, disclosed trade-off rather than a hidden one — anyone specifically chasing the largest possible battery in this generation needs the China-only SKU, which isn't officially sold or supported outside that market. Charging held up well despite the smaller global-market battery: GSMArena's own lab testing measured a full charge from 1% in 43 minutes with the 90W PPS-compatible charger, competitive even against phones with larger cells. 50W wireless charging and genuinely useful reverse-charging support (22.5W wired, 10W wireless, for topping up accessories from the phone's own battery) round out a package that multiple reviewers described as comfortably outlasting most rivals across a couple of days of typical use. NotebookCheck's one criticism here is a fair one: 90W looks strong on paper, but several rival flagships now charge meaningfully faster in everyday use, so treat the number as competitive rather than class-leading.

Verdict

Frequently Asked Questions

How it compares: Xiaomi 17 Ultra vs Xiaomi 17

Xiaomi

Xiaomi 17 Ultra

From £1,349

91

Xiaomi

Xiaomi 17

From €999

88

vs

Snapdragon 8 Elite Gen 5

Chip

Snapdragon 8 Elite Gen 5

200MP Leica quad

Main cam

50MP triple Leica

6,000mAh · 90W

Battery

6,330mAh · 100W

From £1,349

Price

From €999

Full Xiaomi 17 Ultra review

Full Xiaomi 17 review