Buy Xiaomi 17, or Xiaomi 17 Ultra? Complete buying guide

When two flagships share the same processor, the same system, and both bear the Leica logo, the question “which one is better” loses its meaning. It would be more accurate to ask: which one is better for you? The Xiaomi 17 starts at 22,999 CZK, the Ultra at 35,999 CZK. The thirteen thousand CZK difference doesn’t just buy a better camera — it buys a completely different phone philosophy. We had the opportunity to compare both models side-by-side, and here is the verdict.

Compact vs. Ultra: a different weight class

At first grip, you’ll know these are different phones. The Xiaomi 17 weighs 191 grams and, with a 6.3-inch diagonal, is among the last of the compact flagships. It lies naturally in the hand, your thumb can reach virtually the entire display, and you’ll forget it’s in your pocket. The Ultra is a different discipline — 218 grams, a 6.9-inch panel, and two millimeters greater thickness. One-handed operation already requires longer fingers or a certain degree of courage.

Both phones are built on an aluminum frame and glass, and both have IP68 certification. But the Ultra goes further — it adds IP69 resistance for high-pressure water jets and a back made of fiber-reinforced plastic or silicone polymer (depending on the color variant). The 17 has a classic glass back protected by Xiaomi Shield Glass 3.0. In practice, the Ultra is more robust, while the basic model is more elegant.

Displays: bigger doesn’t necessarily mean better

Both models feature LTPO AMOLED panels with an adaptive refresh rate of 1–120 Hz, a peak brightness of 3,500 nits, and support for Dolby Vision and HDR10+. HyperRGB technology with a redesigned subpixel arrangement is also common. What are the differences?

The Xiaomi 17 has a resolution of 2,656 × 1,220 pixels, which, with a smaller diagonal, means a pixel density of 460 ppi. The Ultra offers 2,608 × 1,200 pixels stretched over a larger area, so the pixel density drops to 416 ppi. However, you won’t notice the difference with the naked eye. The bezels of the 17 measure only 1.18 mm, and it’s truly impressive in person — the display seems to reach all the way to the edges.

If you consume a lot of video content, the Ultra’s larger panel will suit you better. However, if you primarily use your phone with one hand, the 17’s compact display is more comfortable.

Camera: this is where those extra thousands are hidden

The main reason why the Ultra costs thirteen thousand more is its camera system. And it must be said, justifiably so.

The basic Xiaomi 17 has a 50Mpx Light Fusion 950 main sensor with a size of 1/1.31 inches and a dynamic range of 13.5 EV, a 50Mpx telephoto lens with 2.6x optical zoom and a focal length of 60 mm, and a 50Mpx ultrawide-angle lens with a 102° field of view. On paper, a solid, in practice an above-average setup — the main sensor excels day and night, the telephoto lens proves useful for portraits thanks to its pleasant focal length and macro capability from 10 cm. The ultrawide-angle camera is decent in good light but struggles at night.

But the Ultra is a different world. The Light Fusion 1050L main sensor is the first 1-inch chip with LOFIC technology in Xiaomi’s history. What does this mean in practice? Classic smartphones handle high-contrast scenes by stacking multiple images into one (multi-frame HDR). LOFIC addresses dynamic range directly at the sensor level — each pixel has an additional capacitor next to the photodiode that captures excess light in bright areas. The result is that in backlit situations, you don’t have to choose between details in shadows and overexposed highlights. You get both at once, from a single exposure, without ghosting or artifacts.

However, the real draw is the telephoto lens. A 200Mpx sensor with mechanical variable optical zoom in the focal length range of 75–100 mm is exceptional in the mobile world. No switching between two lenses, no digital cropping — the lenses physically move, and the image remains consistent across the entire range. The equivalent focal length with digital zoom reaches up to 400 mm, approximately 17x. For portraits at 75–85 mm, you’ll appreciate the pleasant perspective compression, while 100 mm is useful for street photography and details.

The Xiaomi 17 takes very good photos. But the Ultra photographs differently — with the ambition to approach compact cameras, and in many situations, it succeeds.

Video: Ultra adds 4K at 120 fps

Both phones are capable of recording in 8K at 30 fps and 4K at 60 fps in Dolby Vision. However, the Ultra adds the option of 4K at 120 fps in both Dolby Vision and ACES Log, which is a feature for more demanding creators who want to slow down footage without losing resolution. The basic model stops at 4K/60 fps. For casual recording of holidays and social media, the 17 is perfectly sufficient. But if you take video more seriously, the Ultra offers capabilities you won’t find elsewhere.

Battery: smaller phone, longer endurance

Here comes perhaps the biggest surprise of the entire comparison. The compact Xiaomi 17 has a 6,330 mAh battery, while the larger Ultra settles for 6,000 mAh. Combined with a smaller display and lower power demands from the cameras, this practically means that the 17 lasts longer, approximately an hour more of screen-on time (6 vs. 7-8 hours).

Charging is a similar story. The Xiaomi 17 supports 100W wired charging with PPS PD compatibility — so you don’t need a proprietary charger. The Ultra offers 90 W. Wireless charging is 50 W for both, and reverse wired charging is also identical at 22.5 W. If battery life is your priority and you don’t want to deal with an extra charger, the basic model wins.

Performance and software: find the difference

Both phones are powered by the Snapdragon 8 Elite Gen 5, manufactured with a 3nm process featuring Oryon V3 cores, Adreno 840 graphics, LPDDR5X memory, and UFS 4.1 storage. In benchmarks, the differences are minimal — the Ultra has a slightly higher AnTuTu score (2,750,810 vs. 2,640,989 points), which won’t manifest in everyday use. Both can handle anything you throw at them.

The software is identical: Android 16 with HyperOS 3, Google Gemini, Circle to Search, HyperAI features. The Ultra is available in 16/512 GB and 16/1 TB variants, while the 17 starts at 12/256 GB with a 12/512 GB option. If you don’t need a terabyte of storage, you won’t know which phone you’re holding in terms of software and performance.

Connectivity: minor differences for demanding users

The Ultra brings Bluetooth 6.0 compared to version 5.4 on the 17, which means better range and lower power consumption when connecting wireless headphones (if they support the new standard). Both models offer Wi-Fi 7, NFC, an infrared port, and an ultrasonic in-display fingerprint reader. The Ultra also has USB 3.2 Gen 2 compared to Gen 1 on the basic model — you’ll only feel the difference when transferring large files via cable.

Czech prices and introductory offers

The Xiaomi 17 is sold in the Czech Republic starting from 22,999 CZK for the 12/256 GB variant, while the 12/512 GB version costs 25,499 CZK. The Xiaomi 17 Ultra starts at 35,999 CZK (16/512 GB), and the top-tier 16/1 TB configuration will cost 39,999 CZK. Additionally, an introductory offer is valid until the end of March, with a trade-in bonus for an old device of up to 4,500 CZK. Each phone comes with three months of Google AI Pro, YouTube Premium, and four months of Spotify Premium. Ultra buyers can also choose between a Xiaomi Robot Vacuum S40 robotic vacuum cleaner or the Photography Kit Pro.

Who is it for: a clear verdict

Buy the Xiaomi 17 if: You want a flagship phone that fits in your pocket. You’ll appreciate longer battery life, faster charging, and a compact body that’s fantastically easy to operate with one hand. The camera is above average and perfectly sufficient for social media, travel, and everyday photography. It is currently one of the best compact Android flagships you can buy — and that’s no exaggeration.

Buy the Xiaomi 17 Ultra if: Photography and video recording are more than just documenting moments for you. The LOFIC sensor and mechanical telephoto lens represent technologies you won’t find elsewhere on the market in this form. If overexposed highlights in backlit situations bother you, if you zoom more often than occasionally, and if you want 4K at 120 fps in Log format, the Ultra will justify the premium. For everyone else, it’s a phone that can do more than you’ll use.

Would you opt for the compact 17, or the photographic Ultra?