Kenner G. Kemp

SF is in 1.66 aspect ratio. Whether this is the intended ratio or a compromise isn't clear.

American Film Institute's catalog and Variety's contemporary review list it as 1.66, but other sources disagree.
Exhibitor's contemporary review lists it as 1.85, IMDB and an internal pre-production note from Warner Bros. list it as 1.75.

Kino Lorber 4K Blu-ray is disappointing (review)

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.

An undeniably significant improvement from the BD yet still severely flawed. See DFIC's review.

Criterion 4K Blu-ray (review)

A new transfer from the optical soundtrack negative.

the older Blu-ray is included in the Criterion 4K Blu-ray

Included in the Complete Kubrick box set with FiM encode of the same master from the Universal release without the filtering.

DTS:X mix on Universal 4K Blu-ray most closely approximates original surround mix

Criterion DVD and Universal 4K Blu-ray has additional features not found on the Criterion 4K Blu-ray