Just thought I would contribute my experience with Android Lollipop 5.0.
I flashed my z ultra to GPe and have been running lollipop for few days.
So far everything works good. I have also change the system DPI to 280. Nice to have tablet view of chrome and the smaller size keyboard.
Camera works fine. I think with the stock google camera the quality may improve a bit but I'm not exactly sure. I use this z ultra as a small tablet and I gotta say I'm enjoying it more than the nexus 7. The form is really neat as a light tablet. The camera is no worse if compared to a majority of tablets out there.
GPS, cellular, WiFi all working as it should. Really no complains and 5.0 is really smooth and makes it feels like a new phone. Was running official Sony ROM for 1 year.
With the asking price, nowadays below RM1k I think pretty awesome for a device that performs like this.
Also to add, multi user works good. With separate accounts for me and my wife. We are able to have both our apps running on the same device with no clutter from apps we each use separately.
Cheers.
what about battery? I'm considering selling off mine due to the poor battery and camera. If both improves, then I will keep it.
Thanks for sharing anyway.