a) Adaptive brightness has improved by 80%
b) Camera focus speed is increased
c) Typing experience is improved by 100%, very smooth transitions between keyword suggestions.
d) Battery backup is also better
e) Transitions between recent apps, opening apps, opening home screen is very very smooth.
f) Camera lense and mode change are very smooth.
2) Extra useful Features:-
a) Availability of Edge panel and lighting
b) Rest yet to explore
3) Noticed bugs:-
a) When Google duo is in recent apps, camera app is very lagging.
b) Frame Drops when playing Call of duty, but considering the fact when android 10 released to m30s, that time was also laggy, but later fixed.
c) Rest yet to explore.
I have shared my initial day experience, later will upload more details about more bugs, if present.
Now, it's upto you, whether you will do update or, not.