Davetherave, I just finished comparing the mofi to my original US pressing, and was also about to post that the thin-sounding sax on the mofi sounds like a kazoo, when I read your post! The original US pressing is more full-bodied and organic. More life in the presence region, and more revealing of background detail. But neither version does ultimate justice to the Stones.
Lucas, the SACDs are great. I particularly like Satanic Majesty. The SACD brings out all kinds of details buried deep in the mix.