Wasn’t as noticeable on the 12 compared to the pro max, the panel on the 12 had way better contrast, everything had a lot more color to it, it was the first thing I noticed after setting up the phone, using the the default iOS 14 wallpaper it had a deep rich color, looking at the pro max with the same wallpaper, it looks lifeless, dull, faded, reds look more orange than red.
Night mode looks horrible on the pro max, grey and whites are even more yellow when night mode is in use.
Highly doubt apple is using Samsung panels in their pro models, if they are, they are using really cheap panels.
My xs max screen was flawless, regretting that I sold it.