[Xiaomi Mi 11 Ultra] shalabhvickysom:
You will get 6.5 hours to 7 hours SOT if you use the entire battery from 100% to 1% this is on 120Hz+WQHD

But this also depends upon when do you use the device. For example if you charge it and straight away use it for an extended period of time, you will obviously get a better SOT. If you charge it and keep it overnight standby, and then use it intermittently with brief periods of dozes obviously you will get less SOT. That said you will get atleast a day of usage and then some, if you don't game a lot. Camera drains the battery like crazy. So that's another variable.

Heat-I don't know what expectations you have from your phone but the normal operating temperature for this phone and Snapdragon 888 chips in general is 32-40 degree Celsius in normal usage. It fluctuates. Heat dissipation is excellent and hence you feel the surface and chassis getting hot. On charging the temperatures reach 40-42 degrees in later stages. Haven't gamed on this phone, but on camera usage, the temperature easily reaches 47-48 degree Celsius within 10-15 min of usage. Beyond 47 degrees it warns you the exposure won't work unless you cool down the phone, you can still use the camera but do so at your own risk. At this point if you are using this phone without a cover or case, it will become unbearable to hold specially the metal frame and also top back of the phone where the camera module is. All this ofcourse varies with ambient temperatures and I have provided an account with ambient temperature of 35-38 degree Celsius.

It has excellent speakers bested only by your own device the ROG phone 5. So for anyone else it would be an upgrade but for you it might feel like a downgrade if you compare side by side. There is no proper vent for top speaker, it is actually a dual eapiece speaker set. The grill on the top is just for aesthetics.

Cameras are the reason we all are with this device and they are exceptional. The most versatile camera system this year. Coming from ROG phone 5 it would seem like a massive massive upgrade.

Software is the Achilles Heal of this device. MIUI is a great ROM but notorious for its bugs. The updates are few and far in between. Compare it to any other smartphone launched this year and it falls far behind when it comes to Software Support. Ofcourse this varies by region, China for example gets weekly updates, India for example has recieve only one update since the July launch here. Compare this to OnePlus 9Pro which has received excess of 3 updates within one month. Most people switch their ROM to Xiaomi dot EU or China ROM.

Do I regret buying this phone - No because it was an excellent bang for the buck. I chose this over OnePlus 9 Pro, Samsung S21+, Vivo x60pro+ and iPhone 12. It was cheapest of them all with better feature set. The only lacking feature in Mi 11 Ultra was lack of variable refresh rate/LTPO display so the display is locked between 120Hz and 60Hz. This adds to heating, and worsens the battery life. If it had LTPO display like others I don't think this phone would be having any deficiency compared to others and the battery life would truly feel like the one we should get with a 5k mAh battery.

Does that mean I am very satisfied with my purchase? No. My two biggest qualms are the Heat and the software support or lack thereof. Indian MIUI is a bit buggy but nothing major. Bugs like Dark Mode-q patching white text black on black background in a couple of apps, calender unable to calculate date interval. Minor stuff. But there has been no update to fix or limit the heating issues and it seems the only update we will get this year is the MIUI Enhanced Edition update that will have different performance mode using which we can limit some heat. This and maybe MIUI 13 by the end of the year.

I can't comment on the other two devices as they are not available here, but having used Flagships before (OnePlus) my no 1 requirement was Camera. But also the package as a whole. If another phone had better feature set and cameras in the price range I was looking for would have certainly opted for it. Like Vivo had excellent cameras but no IP rating, inferior display protections, smaller battery for exact same price here. So although the cameras were excellent I didn't opt for it mainly because of these issues as well as lack of commitment from Vivo to provide 3 years or even 2 years of updates. Also community support has been excellent for Xiaomi Phones and very poor for Vivo, you can check here on XDA.

Hope this helps.