A short story:
I used many phones with OLED panels (Galaxy S3, S4, S5, Note 4, 2x S7 Edge, S8+).
In 2017 I switched to iPhone and since then I had the X, Xs, 2x 11 Pro Max, 12 Pro Max and now 13 Pro Max and I can tell you:
ALL of them where not perfect on grey and/or pure white backgrounds (at 0-20% brightness, in a dark room!).
My launch day 11 PM midnight green had a really bad panel (banding + un-uniformity). I couldn’t live with it and swapped it for a gold 11 PM after 6 months, which at the end was even worse than the midnight green. I regretted it so much.
The 12 PM was slighty darker around the borders (vignette) especially in the notch area, but it was ok for me.
My 13 PM has a slight but noticeable reddish shift/hue on the right side of the screen but only at 0-15% brightness on white and grey backgrounds WITH nightshift and Truetone on + slight banding in the notch area, but I can live with it.
For work I’m currently using a S21, same imperfections on 5-20% grey backgrounds at lowest brightness (blue light filter off).
I spent so many hours in forums and blogs to read about the problems of OLED the last couple of years and here is my conclusion:
See you guys next year! 😂