Just watched my copy of this new transfer. As you can see from the comparisons on dvdbeaver.com, the old HD version looked pretty good but this new one is wonderful -- a new 6K scan of the original 8-perf Technirama negative combined with the color from a scan of the b&w separation masters, finished at 4K. The new HD version is sharper than the old one but using much less edge enhancement to get there. Skin tones are more natural, less brown.
Maybe someday "2001" will get a similar treatment.