Films

UK MoC Blu-ray uses the same restoration as Criterion but has more natural contrast and more organic grains see caps

MoC Blu-ray has the exactly same audio as Criterion Blu-ray

Crystal clear, albeit with some distortion in louder areas

The 4K Blu-ray reuses the same poor mastering used on the 2006 WB Blu-ray, only with a completely unnecessary bass cut and extra noise reduction.

Even putting resolution aside, the Warner Archive 4K Blu-ray has the best video. The old Blu-ray master and earlier DVD both had massive issues with colour.

That said, picture on the 4K Blu-ray isn't perfect, with strange posterized magenta glints and some instances of DNR: https://bsky.app/profile/dagscott.bsky.social/post/3leahavqi7k2l

Kadokawa Blu-ray is new 4K restoration

Intact grain compared to Toho/BFI UHDs' DNR'd master

Criterion 4K Blu-ray is good, derived from the 1995 Criterion LaserDisc (which would be minimally better due to its lack of filtering) see blah-ray

Japan Sony Blu-ray for the original theatrical 6.1 audio mix

Theatrical Cut: Streaming: Kaleidescape > Movies Anywhere > Disney+

For BD:

• Carlotta France Blu-ray slightly better than Arbelos US Blu-ray, both are FiM-encodes with tradeoffs. Carlotta is best in dark scenes.

• Curzon UK Blu-ray has squished AR
  Bela Tarr Curzon Collection uses the same bad Curzon Blu-ray

Curzon 4K Blu-ray see caps

For BD, Curzon Blu-ray is similar to Arbelos Blu-ray

(exclusive with Sony 3D TV bundles in the US)

All home video releases are open matte 16:9. No home release in the theatrical scope presentation.

The original theatrical 7.1 mix has not been given a home release.

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

Germany Turbine Mediabook Blu-ray has a superior MPEG-4 AVC encode over the US Sony Blu-ray's MPEG-2 or France/Australia Universal Blu-ray's VC-1. Open matte version also included

Germany Turbine Mediabook Blu-ray is completely uncut and uncensored, having none of Sony US's PG-13 edits or Pathé UK's BBFC horse trip cuts.