Finally I was able to get a screenshot of the legendary Criterion CAV 3-disc Laserdisc set (1989) ..
.. that was reported by LaserDisc Database as "This transfer was supervised and corrected by Stanley Kubrick himself" (verifiable on eBay when it's contents statement-sheet is shown close-up for reading). Note that this Criterion Collection release was made when MGM controlled the rights to 2001.
A few years later, MGM released the CAV 3-disc 25th Anniversary Laserdisc set (1993). I'm still looking to get a screenshot of that one, but it was described as being from the original 65mm film, via film-to-tape, with shot-by-shot color correction (to "fix" problems like too dim to be seen stars, and brightness variations) but not in complete accord with Kubrick's color scheme.
[missing 1993 LD screenshot]
More years later, MGM released a DVD in 1998 that I expect was from that same transfer & correction of the 25th Anniversary LD. That laserdisc should then look like this DVD:
It's only close to the Kubrick-supervised release, but much closer than the later Warner releases when they obtained the movie rights. (See DVDBeaver's 2001 comparative review for lots of these screenshots.) The latest hi-def releases do better by cutting back on the blue-light bath (next screenshot), but are still far from the one on which Kubrick actually worked.
I earlier found a statement on Amazon-UK, quoting a (professional) reviewer, that Kubrick worked on a new transfer for the Warner DVD year-2001 release of 2001: A Space Odyssey ..
I think this color palette is cause for complete dismissal of that assertion. Further, an interview of technical assistant Leon Vitali, someone who actually worked on the 2001 release of the Stanley Kubrick Collection DVDs, states that Kubrick's involvement was only at the very early planning stage -- just before his untimely death.
Kubrick Questions Finally Answered
http://www.dvdtalk.com/leonvitaliinterview.html
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.