ASUS ROG Phone II ZS660KL vs Xiaomi 15 Ultra
The ASUS ROG Phone II ZS660KL (2019) runs on the Qualcomm Snapdragon 855+, while the Xiaomi 15 Ultra (2025) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $899 and $999. By overall MobileRank rating, the Xiaomi 15 Ultra leads — 85/100 vs 52/100 (a 33-point difference). Key differences: the main camera is 48 MP vs 50 MP; the Xiaomi 15 Ultra is faster in AnTuTu (3,030,376 vs 859,084); the Xiaomi 15 Ultra is noticeably lighter (225g vs 240g).
Profile comparison
Category scores
ASUS ROG Phone II ZS660KL
Xiaomi 15 Ultra
What makes ASUS ROG Phone II ZS660KL better?
- Cheaper at launch: $899 vs $999
- Overall rating 52/100
What makes Xiaomi 15 Ultra better?
- Higher AnTuTu: 3030376 vs 859084
- Better Geekbench Single: 3050 vs 1031
- Better Geekbench Multi: 10200 vs 2864
- Faster charging: 90W vs 30W
- Better main camera: 50MP vs 48MP
- Lighter: 225g vs 240g
- Higher performance (92/100 vs 55/100)
- Better camera (87/100 vs 39/100)
- Longer battery life (80/100 vs 53/100)
- Better display (90/100 vs 79/100)
- Better portability (29/100 vs 20/100)
Comparison verdict
Comparing the ASUS ROG Phone II ZS660KL vs the Xiaomi 15 Ultra, the Xiaomi 15 Ultra scores 33 points higher (85/100 vs 52/100). In the "performance" category, the Xiaomi 15 Ultra leads (92/100 vs 55/100). In the "camera" category, the Xiaomi 15 Ultra leads (87/100 vs 39/100). In the "battery" category, the Xiaomi 15 Ultra leads (80/100 vs 53/100). Value score: ASUS ROG Phone II ZS660KL — 16/100, Xiaomi 15 Ultra — 80/100; it shows how far a model sits above or below the usual level for its price, and is not part of the overall rating. In the "performance" category, the Xiaomi 15 Ultra significantly outperforms the ASUS ROG Phone II ZS660KL (92/100 vs 55/100). In the "display" category, the Xiaomi 15 Ultra is a bit better (90/100 vs 79/100). In the "camera" category, the Xiaomi 15 Ultra significantly outperforms the ASUS ROG Phone II ZS660KL (87/100 vs 39/100). In the "battery" category, the Xiaomi 15 Ultra notably outperforms the ASUS ROG Phone II ZS660KL (80/100 vs 53/100). In the "portability" category, the Xiaomi 15 Ultra is a bit better (29/100 vs 20/100).
Specs comparison
| Specification | ASUS ROG Phone II ZS660KL | Xiaomi 15 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 855+ | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 859084 | 3030376 | |
| Geekbench Single | 1031 | 3050 | |
| Geekbench Multi | 2864 | 10200 | |
| Display | 6.6" AMOLED | 6.7" LTPO AMOLED | |
| Resolution | 1080x2340 | 3200x1440 | |
| Refresh rate | 120 Hz | 120 Hz | |
| Battery | 6000 mAh | 6000 mAh | |
| Charging | 30W | 90W | |
| Wireless charging | 0W | 50W | |
| DXOMark (camera) | — | 159 | |
| Main camera | 48 MP | 50 MP | |
| Ultrawide | 13 MP | 50 MP | |
| Telephoto | 0 MP | 50 MP | |
| Front camera | 24 MP | 32 MP | |
| RAM | 8GB / 12GB | 16GB | |
| Storage | 128GB / 256GB / 512GB / 1TB | 256GB / 512GB / 1TB | |
| OS | Android 9.0 / ROG UI | Android 15 / HyperOS 2 | |
| Brightness (peak) | — | 3200 nits | |
| NFC | yes | yes | |
| Protection | — | IP68 | |
| Dimensions | 171.0×77.6×9.5 mm | 161.3×75.3×9.4 mm | |
| Weight | 240 g | 225 g | |
| Launch price | $899 | $999 |
Camera comparison
ASUS ROG Phone II ZS660KL
- Main: 48MP f/1.8
- Ultrawide: 13MP
- Front: 24MP
Xiaomi 15 Ultra
- Main: 50MP f/1.63
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Display comparison
ASUS ROG Phone II ZS660KL
- 6.6" AMOLED
- Resolution: 1080x2340
- Refresh rate: 120 Hz
Xiaomi 15 Ultra
- 6.7" LTPO AMOLED
- Resolution: 3200x1440
- Refresh rate: 120 Hz
Battery and charging
ASUS ROG Phone II ZS660KL
- 6000 mAh
- Wired: 30W
- No wireless charging
Xiaomi 15 Ultra
- 6000 mAh
- NanoReview test: web browsing 12:19 hrs, total 30:03 hrs
- Wired: 90W
- Wireless: 50W
Overall performance score
We compared ASUS ROG Phone II ZS660KL and Xiaomi 15 Ultra, covering their specs and all relevant benchmarks.
Xiaomi 15 Ultra leads ASUS ROG Phone II ZS660KL by 71.7% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $100. ASUS ROG Phone II ZS660KL was $100 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Xiaomi 15 Ultra significantly outperforms the ASUS ROG Phone II ZS660KL (92/100 vs 55/100).
display
In the "display" category, the Xiaomi 15 Ultra is a bit better (90/100 vs 79/100).
camera
In the "camera" category, the Xiaomi 15 Ultra significantly outperforms the ASUS ROG Phone II ZS660KL (87/100 vs 39/100).
battery
In the "battery" category, the Xiaomi 15 Ultra notably outperforms the ASUS ROG Phone II ZS660KL (80/100 vs 53/100).
portability
In the "portability" category, the Xiaomi 15 Ultra is a bit better (29/100 vs 20/100).
Frequently asked questions
Which is better: the ASUS ROG Phone II ZS660KL or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra significantly outperforms the ASUS ROG Phone II ZS660KL by 33 points (85/100 vs 52/100).
What is the rating of the ASUS ROG Phone II ZS660KL and the Xiaomi 15 Ultra?
The ASUS ROG Phone II ZS660KL has a MobileRank rating of 52/100, the Xiaomi 15 Ultra — 85/100.
Which has the better camera: the ASUS ROG Phone II ZS660KL or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra leads on camera score (87/100 vs 39/100).
Which is more powerful: the ASUS ROG Phone II ZS660KL or the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra leads on performance (92/100 vs 55/100).
Should you choose the ASUS ROG Phone II ZS660KL over the Xiaomi 15 Ultra?
The Xiaomi 15 Ultra is a better fit for gamers and power users, mobile photography enthusiasts, those who care about battery life, budget-conscious buyers.