I can't post a screenshot, already downgraded, and i'm not going to upgrade again.
The problem is little. And perhaps you won't notice it, but i'm a bit obsessed about the screen, so had to downgrade.
Try this, open bing news, and watch how characters are displayed. You should notice the top pixel of some random letter missing, in other points there is too black around some characters.
It should be evident watching facebook newsfeed from the app, in the square of shared articles...
This is due to the pentile 1080p not yet perfectly supported in the upgrade, and it's the cause 930 wasn't selected for the win 10 preview.
I've had a 920 constantly on DP and i noticed that when the released the full upgrade with the firmware, the phone got snappier.
930 firmware is not optimized for GDR 2 and i'm not going to use it again, i fear to shorten the life of the display matrix uncorrectly driven...