Notification bar turns silver/grey for a second when going from lock screen to home.
Contact pictures in messaging app randomly disappear. They come back after exiting the app and re-entering or a reboot.
Proximity sensor : More often than not, when pulling the phone away from my face it takes a few seconds (and sometimes not at all) for the screen to come back on.
All these worked flawlessly before the 4.3 update and yes, before anyone asks, I have done a factory reset....twice.
AFWIW......GOOGLE......
Changing the signal bars from showing cellular strength to data strength is the craziest p00P tube I think you have ever come up with. I need to know I have cellular signal BEFORE I make a call, not after (or during) the call. Some of need it to be a PHONE FIRST!! Data and everything else a close second.
/end rant