Marcello Mastroianni

Image Entertainment DVD is slightly better than Criterion 4K Blu-ray/Blu-ray/DVD (all basically the same)
Other Blu-ray releases are all much worse.

Cohen Blu-ray is the best with the least amount of DNR or sharpening among Germany StudioCanal, UK MoC and France Gaumont. Even though Cohen doesn't have the best encoding, it's definitely the most superior release. See caps-a-holics caps

2014 Criterion Blu-ray is from the same master and has only slightly worse compression. JP/DE/FR releases all have incorrect levels. Caps

All Blu-ray releases are from the same mastering, superior to the one on older DVD releases which is sourced from a higher generation source. They all sound about the same, with the exception of Criterion, which sounds worse due to extraneous filtering.

Paramount's disc also includes a contemporary English dub, previously unreleased on home video.

Janus have restored DCP but no Blu-ray release yet

But not English friendly.

WB has HD Streaming on multiple platforms, but no home release.

Included as extras in the Criterion 8½ Blu-ray. Looks like SD source, and in a very rough quality.

StudioCanal France has Blu-ray

Eureka MoC marginally better than Criterion