Well, two days ago i installed Lollipop on my Xperia Z3C because i could not wait any longer for the OTA.
I downloaded the file and use Flashtool to install it.
It took about 15 minutes to install. I was so stupid to wipe the data so had to install almost everything from scratch.
I must say, it is awesome !!! Whenever you can get your hands on this update, TAKE IT !
It is indeed a great improvement. It is fast and battery life is defenitly longer. In my feeling 1,5 - 2 X
Sony did some work on the stock lollypop like incoming calls look kinda Kitkat and End call is not circular but still the wide button, which is better.
Lockscreen clock is different too, you can choose out of three clocks, no other tough. Lockscreen is dimmed, has dark overlay, i don't know why.
The lockscreen can be improved i think.
I have it only for htwo days so need some more time but so far i do not regret this update in any way, unlike most IOS updates.