La Ciénaga (2001)

UK Arrow 4K Blu-ray in December

Criterion 4K Blu-ray or Germany Plaion 4K Blu-ray - subtle difference in encoding to the Criterion in encoding, trading blows in different shots, with Plaion taking a slight edge with less highlight blocking

1993 MGM LaserDisc/2000 Region 1 MGM DVD

Criterion's 2.0 sounds muffled due to noise reduction and EQ.
Plaion's 2.0 lacks bass and has a very bright EQ, more resembling the 5.1 remix. Plaion’s 2.0 doesn't have any filtering unlike the Criterion, see https://forum.blu-ray.com/showpost.php?p=23831289&postcount=110

US Synapse 4K Blu-ray or UK Shameless 4K Blu-ray (some may prefer Synapse's grading, while some prefer Shameless's grading)

4.0 track on the Synapse 4K Blu-ray

Paramount 4K Blu-ray. See caps
HDR/grading: nice, but some blown out
Encoding: inconsistent, smeared motion
DNR: inconsistent, frozen
Old Paramount Blu-ray is arguably a solid alternative choice

Paramount 4K Blu-ray mono is different version of the Blu-ray mono from the same old 2000 DVD transfer.

The 5.1 remix on the 4K Blu-ray is an appalling remix done by going wild with artificially generated stems from Park Road Post who were given the surviving mono to separate. The experience is jarring and fidelity to original mix in terms of level balance, directionality and impact is nonexistent. Not only does this sound painfully weird, but the Paramount mixers then did whatever they wanted in terms of LFE, sound pans and effect changes.
The original mono mix was not restored and still needs it badly. The 4K master is filled with frozen grain examples coming and going plus some HDR issues in addition to the usual Paramount problems. It is simultaneously better and worse than the Blu-ray master.