My Air 2 has no tinting issues. If I was very fussy, there is the slightest hint of bookspine. However, having had to replace my Air 6 times and my rMini 5 times for various screen issues, I'm educated in the process enough to know that the screen i have now is about as perfect as you can get.
My first (and last) attempt at in Air 2 has a dead pixel. I'm so fed up with Apple's abysmal QC. Had 3 iPhone 6 all with dead pixels. Gave up on the first Air due to the horrible patchy yellow screens and book spine thingy.
So sticking with my Mini R until they do a proper upgrade on the Mini.