So update for my phone and quick history because my post is from launch:
Ordered a pro 12, phone was great but my sisters regular 12 and wife’s iPhone X both a lot brighter. My phone also fairly yellow.
They didn’t have any stock of the pro so I sampled the regular 12 which I liked, was whiter, and the mini which surprisingly was pleasant to use but too small for me after having a week with it.
I got a new iPhone 12 pro and screen is great. Crisp, bright and not yellow. Very pleasing actually. Staying with this one happy now.