Spaced Ranger said:

Short of actual, nonfaded 1960's 70mm film, a confident conclusion is that the Criterion Collection laserdisc release is the only (consumer) release with the true look of 2001: A Space Odyssey.

That is, of course, assuming that Kubrick actually color-timed the Criterion edition according to what the film looked like when it had been released twenty years earlier. Kubrick wasn't above home video revisionism (e.g. the variable aspect ratio of Dr. Strangelove).