Frances Lee McCain

It's a very naturally soft film so the 4K's the best it's ever gonna look and it's actually one of Paramount's well-encoded UHDs; still not free of Paramount's typical tomfoolery though according to Geoff D

US Sony 2023 Steelbook Edition 4K Blu-ray > Sony 2019 Standard Edition 4K Blu-ray

US Sony 2023 Steelbook 4K Blu-ray added Dolby Vision and more extras

DVD and Blu-ray both have lossy Mono

The DVD has an isolated score track 
In addition to the new Atmos track, both 4K Blu-ray releases have ported over the previous lossless 5.1 remix from the older 1080p Blu-ray in DTS-HD MA 5.1 and also include the original theatrical mono mix in lossless DTS-HD MA 2.0 Mono

Only the US Steelbook has Dolby Vision

Fan preservation is likely better quality.

The 2011 Lionsgate Blu-ray is incredibly poor for every Original Trilogy film; older processed older DVD-era masters with heavy use of DNR, sharpening and edge enhancement with a really dull color grade. The 4K Blu-ray is miles better. The DTS-HD 5.1 across all three films appears to be the same on both the Blu-ray and 4K Blu-ray, and they appear to be the untouched theatrical 5.1 mixes. 

The Uncut version has more violence: https://www.movie-censorship.com/report.php?ID=256325