Well, I don’t have a 4K set, but I watched ANH last night in 1080p and it looked fantastic. The color timing looked extremely similar to 4K77, which is a very good thing, imo. And yeah, like others have said, many of the screenshots posted showing the colors being really washed out do NOT represent how it looked when I watched it. It was very nice looking and a real breath of fresh air compared to every other release from the past 14 years.
JEDIT: just checked on my iPad and ANH looks just as good. I did have to remember to turn my screen brightness back up. Normally I turn the brightness down to about 50% or less, but when watching videos (any videos, not just Disney+) I have to turn it up to 80%-100% for the contrast to be reasonable.