I checked my discs today (on Xbox One S) and the theatrical cut definitely has frame rate issues.. it's quite choppy. I will say though, the film looks less dark than the previous Arrow blu-ray and the new 4K is a noticeably better transfer, although I am watching and comparing on a 100' screen.
Both discs play fine, full 4K HDR, on my Region Free LG UBK90. Haven’t caught up to the part where the audio cuts out yet, watching the theatrical cut now.
Have brightness all the way up on my TV (Samsung QLED) and the movie looks normal... like it has any other time I’ve watched. On par with, or slightly better than the previous Arrow reissue.