John George

HD transfer slightly better than Carlotta

The film survives as a single nitrate Technicolor print, copied by the UCLA Film and Television Archive.

Criterion Blu-ray and MoC have the same restoration, but different contrast levels, Criterion seems to be better see caps https://caps-a-holic.com/c.php?d1=3412&d2=3413&c=1417

UK Arrow Blu-ray is slightly better than Criterion or Germany Spirit Blu-ray

The 4K discs in both Criterion and Imprint sets are FiM encodes, but low-passed. The compression is better, but some of the grain is lost. Difference is pronounced in screen caps, but not likely to be noticed during playback, without a reference to compare it to. Comparisons

All discs use the same source transfer. It's not of the highest quality, and it includes some slight distortion, looping, clicks, pops, and hum. Criterion cleaned it up for their release, but unfortunately also lost a lot of fidelity in the process.

MGM NTSC DVD doesn't seem to have some of the more prominent distortion and has slightly different EQ but is otherwise the same.

The Criterion Complete Kubrick and Imprint 1953-1957 sets include remastered BDs. All standalone releases are from an earlier master.
Arrow UK Blu-ray has an exclusive isolated score & effects track. Kino Lorber and Imprint have an exclusive commentary each.