I love the Mini-LED display of the new iPad Pro. It makes more sense than OLED in terms of color volume and accuracy at high brightness. OLED could not even maintain this brightness level, i guess ABL / ASBL would be an issue then, maybe also vertical banding and needless to say burn-in over time. I don't know if the power consumption would be even higher on OLED, especially at high fullscreen brightness.
I mean, i love my LG C9 OLED, i'm a huge fan of OLED especially for gaming, but in this case for an iPad and it's use case it's the wrong tech. I also tested my C9 against the iPad side by side and bright HDR scenes clearly look better on the iPad, it comes more to life with these specular highlights and great color. I also like the fact that there is no sign of DSE, banding, clouding or other uniformity issues (except the slight shadow around the edges which is ultra negligible for me)
There is in fact some blooming, but on most content it is very subtle imo. An absolute stress test for the iPad is the beginning of "Oxygen" on Netflix. Most content looks stunning, but scenes like this look pretty awful. I'm sure this can be fixed with an update. Apple has to look into local dimming zone control, because my Samsung Q90T with only 120 dimming zones can show this scene in a much less distracting way.
Overall i'm very pleased.