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My 6s+ has dark corners it's pretty noticeable on a white background which is all of ios9
 
The one I bought for my mom has a noticeable gradient on a white background. It's grey-ish at the top and gets lighter as you go down. I'll post a picture later.
 
The one I bought for my mom has a noticeable gradient on a white background. It's grey-ish at the top and gets lighter as you go down. I'll post a picture later.

I can confirm that most if not all do, at varying degrees.

dL
 
That would be great if you can post some pics


Here is my 6S - no issues

IMG_0190.jpg
 
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