Your screen looks ok.Personally I'm pretty satisfied with mine. My imagination wants to tell me the whole upper left corner is yellow. Even if it is I literally just got off the Air 2 train, and I don't feel like doing it again. Hopefully Apple expands OLED usage to phones and tablets with the next generation. It'll be great to buy the 7S and not worry about this stuff anymore.
Hate playing the Apple Screen lottery game happened to me last year iPhone 6 took me 6 exchanges due to dead/stuck pixels and yellow screen with dust under screen too.
(Wasted over one month doing it.)
iPad Air 2 took me 5 exchanges too with the same problems.
The quicker Apple uses OLED I will be happy.
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