Films

Cropped from 1.37:1 to 1.85:1 for original theatrical distribution. Opened up back to 1.37:1 for remaster per director’s request 

Eureka MoC Blu-ray > Kino Lorber (see slowpics for comparison). No information on Potemkine.

MoC has higher bitrate than Kino Lorber, also the contrast is increased. But there is no noticeable reduction in visible film damage presented between the two offerings.

UK StudioCanal has more extras

US Arbelos Blu-ray (encoded by FiM) or UK MoC Blu-ray. Both are the same 4K restoration. No comparison available

Given that Indicator Blu-ray is encoded by FiM and Kino Lorber uses the same transfer judging from different screenshots, Indicator is most likely to be better encoded.

Indicator Blu-ray is sharper than either Sony Blu-ray or Image Entertainment Blu-ray and a slightly different color grading see caps

Cohen Blu-ray is suspected to have incorrect gamma level, while also have a different grading than MoC see caps for gamma correction and caps-a-holic

The replacement 4K disc fixes the missing LFE in the original disc.

"4K DI, good resolution upgrade but mediocre encode" per nicolas

Walmart exclusive BD has a bonus disc.

Second Sight 4K Blu-ray is a Criterion SDR master with a HDR grade. Caps & comparison