The UEs give the correct ratios (Except that Goldeneye is cropped and so is the opening teaser of AVTAK) like the majority of the LDs. They pale in the sound category. Detail is exceptional on the UEs. Sometimes I feel like things are too cleaned up. (especially on original effects shots). The colors on the UEs ranged from okay to great to what the heck to desaturated (YOLT!). I've gotten two from the 89 LD series and the colors are spot on like I remember from childhood. (And YOLT has the rich saturation back!)
The HD to SD thing was just a theory I came up with. I don't think the studio would have tampered with these color wise.