I bought an iPad Pro 12.9 inch from an Apple Store, the screen was warmer than my old iPhone 6s or iPad Air (with true tone and night shift off of course), making the display look less colourful and dimmer than what I expected (although warm display is good for eyes). I expected highly on iPad Pro's display, as Apple claim it to have features like P3 wide gamuts, 120Hz refresh rate, support for HDR... The yellow tint and low contrast (compared to oled) definitely make the colours look less compelling (one major reason I chose iPad Pro over Surface Pro). I went to the Apple Store for an exchange. Apple's service was unparalleled. They provided two exchanges in a row (the first exchanged one looked worse than the original one). I compared all the three machines side by side with one displayed in store, I found that all the three were somehow yellow tinted compared to the one displayed in store, which had perfect white color (but still less cool and clean than my iPhone 6s). At last I decided to live with it as I bet all the machines from this batch probably all have the same problem. The staff claimed this is just how it is, I decided to believe in them this time, as I noticed that this problem occurs in all iPhone/iPad model after the adoption of P3 display. I guess this is just one feature of P3. After some research, I learned that Apple has lowered the white balance level to industry standard 6500K, instead of the 7000-8000K of previous generations. I think this is probably why it looks warmer and definitely not defects. I hope I learned this beforehand so that I wouldn't need to go thought such a hassle.