the 2020 Blu-ray IS in 4k. Also, it’s available everywhere, but that shouldn’t be a problem if you own it.
this should be in the “star Wars Preservations” section not here.It is on 4K HDR10+. Not 4K UltraHD like Disney+.
(And the Blu-ray is very rare to be found as a video file.)
the 4k uhd blu-ray is considered to be better quality then the dolby vision disney+ stream