II will be a bit more complicated, since I'll need to conform the DC to the theatrical for sound sync, but initial impressions are very good. The grain level on the BD was always fine, but it's the colour that really stands out on these transfers - nothing forced, just the way they always looked before twiddling became so popular!
I'm really intrigued as to where in the food chain these transfers fit in. The obvious explanation would be that they're from the masters the DVDs were derived from (they certainly look the same framing and colour-wise) but they're an odd assortment of directors' and theatrical editions - perhaps they were simply what the studio had lying around at the time. In any case I doubt anyone put a great deal of effort into them at any point, but ironically that's provided us with the most honest versions around.
By the way, forgot to mention that VI has the same burnt-in alien language subs as the DC DVD. Possibly theatrical, might have to look at a laserdisc for more evidence though. It will be interesting to see what they look like on I, II, and III.
Jetrell, did you ever sync your theatrical DTS for Generations to anything?