I just got the UHD of this and skimmed through the DE (having previously only seen a miserably encoded 1080p stream on P+).
Weirdly enough, as noted in the last two comments, many live action scenes have an excessive amount of DNR added to them compared to the 4K theatrical cut master (which has its troubles with noise reduction but generally looks okay). It's very extremely inconsistent with how much they smooth it out, but it can get real bad, and it's ridiculous that they added any compared to the master Paramount prepared. Likely one of the producers asking for it to be smoother in the room, lol, boooo. I had been pretty gentle with those guys because they got this made basically on their own, but this is real stupid. Not all of the live action is effected either, it's either "off" or on at a very excessive level.
Effects shots vary as to if the theatrical or DE looks better as they both have (differently applied) DNR on them.
Here's a very quick sample, for shots with and without added DNR (from the blurays, but same masters):
https://slow.pics/c/v22RNJoB
I don't have the ability to grade or edit in HDR, but looking at this, I'll likely be doing a 1080p SDR fan edit similar to what I did here (preferring many of the theatrical effects for the most part) but with the added benefit of killing as much noise reduction as I can.
No idea when I'll actually get around to making/releasing this (could be awhile), but I'm putting it out there, because, boy, does some of this look rough.