I'm pretty picky in this area as well, I returned 3 1st gen 12.9" iPad Pro units because of this. I have the 13" 2018 with LG, no issues at all. Even color and lighting across the panel.
I returned my first two 15" 2016 models for color tints and kept the 3rd which had a subtle left to right pink to blue shift that I could live with. My 15" new 2018 model has what I consider a perfect screen (white, bright and no color tints or unevenness). I don't know if the issue is fixed or if I just got lucky. In my opinion getting a good screen has always been like a lottery. It's early, but the lack of screen complaints on the 2018 model to date I see as a good sign.
Absolutely delighted to hear that. In the coming months, going to order 15" with 32gb of Ram, so it's going to be "custom" build. Would be an awful hassle to wait 2 weeks, return, wait another 2 weeks etc.
Thank you for your early impressions and answers. Really great to see that Apple has stepped up their screen-quality game with True Tone.