Just got myself the bluray and CD edition of this, and am very surprised at the sound quality of the new mixes done by original producer George Martins son, Giles. I can actually hear the hi hat and clear crisp toms for the first time.
Also the stereo is much more balanced. None of that vocals on the left instruments on the right nonsense!
I realise that you shouldnt muck about too much with classic recordings, but wow!
Casual listeners shouldnt notice too much difference, but I have been pleasantly surprised.