Device Lumia 1520
OS version windows phone 8.1 cyan
UI looks bad on 1080p screen.
Downloads stop once the screen goes to idle mode with opera still in foreground and can't resume download(selecting resume won't work as the file stays paused.)
No double tap to zoom when zoom is set to 100%.
That's it for now.
ps: I have been using opera mini 5.1 windows mobile version on my Lumia 710(wp7. Thanks xda!)No major difference in UI.since windows phone version is still early in development Its better if you guys port ios version or tablet version of UI instead of this java/android UI.