Definitvely reassuring, but still really annoying ! Especially compared to all other OLED/AMOLED screens out there, TV and other smartphones
I was not expecting such a difference when shooting iPhone's / Ipad with my camera (D7100 with a Nikkor 50mm f/1.8G) but screens appear really different behind the lens.
With my naked eye, here is the order of devices with the warmest to the coolest screen :
iPhoneX > Surface Pro 4 > iPad Mini > iPhone 6 Plus.
The screen I apreciate the most, still through my naked eye: iPhone 6 Plus
All devices are set to the max luminosity with the same settings (TT Off if exists, NS off)
Camera do the white balance itself (but exact same results when I set WB to 5000K)
For me the Surface Pro 4 screen is perfect with true whites, iPhone X is second with a sensitive warmer/pinky white but still white, iPad and iPhone 6 Plus are the same with a greenish white.
I was not expecting such a difference...
Result when I dimmed the brightness:
With NS on:
When I tilt the phone
If perfect white iPhone X can be found, I assume warm screen is a defect !