Wow, thanks for the interest guys, this is the kinda stuff that's been floating around my head for a while.
The MGM and Warner should be identical with the 5.1 track from the last MGM LD release. They had planned a DTS LD which sadly was canceled in the last days of LD.
What I'm wondering is what about the 2001 corrected Warner DVD, which should be in between the MGM first disc and the new digital master. I've got this one and will give a spin through and spot check some things.
The MGM CLV is indeed not color accurate, it looks pitiful compared against the Criterion and as if the colorist simply went to sleep. The audio is the same and may be a bit cleaner (I'm only guessing as the Criterion was great except for 4-5 very minor spots of distortion/damage for the whole feature)