so i went in to exchange my XS due to the pink tint that resulted from a minor angle shift, but when I compared my phone to at least 6 different demo models, mine was *considerably* brighter and whiter than each one. The amount of pink tint that resulted from angle shifts varied from phone to phone, some more than mine and some less, but each one was noticeably duller and less white than mine. I only found one XS demo that remained consistently dull white until it shifted to blue with a greater angle tint, skipping the pink step altogether. I couldn't believe the variance in models, and I have no idea why mine was so much brighter. The top half of my screen is also more pink when shifted than the bottom half.
One of the sales people said that demo models inherently have different settings that can't be manually adjusted, but that seemed a bit far fetched to me.
Needless to say, I was a bit wary of exchanging mine so I left to think it over since I have until next Saturday. I feel like mine just reflects pink at the angle I like to hold it, because if I force myself to hold it higher or lower, it is much better. Maybe I'll just live with it for a year. The performance is definitely better than the X, so I'd like to keep it.
Frankly, this is all absurd. Apple should have better quality control or not release an OLED screen until they can dial in the technology consistently from phone to phone.