Dr. Strangelove (1964)

 Added the 1984 RCA/Columbia LaserDisc.

Dr. Strangelove (1964)

All of these sound rather muffled, with frequencies above 7 kHz rolled off, but the 1994 LaserDisc is slightly better than the rest.

The first R2 DVD is like the LaserDisc but with a noise gate that attenuates the film-related ticks and pops (as well as some real ambient sound, albeit very little). The blu-rays have some further EQ, which I think makes everything sound a bit 'pinched' and thin. The Sony blu-ray and UHD and the Criterion blu-ray are essentially the same. 

Update (12/10/2021): Added the 1984 RCA/Columbia LaserDisc. It's very dupey (source issues) -- by far the worst sounding edition.

Dr. Strangelove (1964)

There are no mastering differences between the AC-3 mono track on the Sony blu-ray and the PCM mono track on the Criterion blu-ray.

The 5.1 remix isn't bad by any means, but there is some incomplete separation of the dialogue from the music/effects, so the dialogue leaks a bit beyond the center channel and thus has a bit of a garbled quality. The mono mix is excellent, however, and offers clearer and more focused-sounding dialogue. Only a few of the action scenes sound like they were given much attention for the 5.1, anyway, and the dialogue-driven scenes (i.e. most of the film) sound better on the mono. You can sync the Criterion audio to the Sony blu-ray with a -13013ms delay.