Just saw your post here. Wanted to comment that I have it too and its lil annoying when you see it as it doesn't go away. lol
btw, this has been a topic over at xda
Tilted Screen?? - Page 7 - xda-developers for a bit and there seems to be various different amounts of "tilt" and also people noticing 2 manufactures for the phones again, this time novatec and sharp, and one of sets even producing a yellowish tint to the white colors on the screen.
Ive got bright whites here on mine but have the tiny tilt in the screen. Now debating if worth getting a replacement and being forced to have the 2 OTA's installed as I worry what if they figure full root s-off but only on the pre OTA versions. I know temp root is working on the current OTA's but always a chance i guess they might have to be on pre ota to get s-off if they find a new hole there that helps more....