Your definition of "perfect" is not the same as mine.
The original mono has zero bass. You like that better?
Unlike some on these forums, I am not personally a bass junkie. I like bass when it's used well, but I don't like bass just for the sake of having bass. I do not feel that it's integrated well in this track. I find it obnoxious. So, yes, I'd rather have less bass than too much.
I agree with the slightly obvious soundstage shifts. But what else can be done? You cannot convert ancient low quality mono and have a soundtrack rivaling that of Avatar's.
I don't expect this movie to sound like Avatar. But even for what it is, this track is sloppy. I've heard many better 5.1 remixes of old mono sources. In fact, I watched You Only Live Twice in the new James Bond box set the other night and was pleasantly surprised by its 5.1 mix (whereas other titles in the same set sound awful in 5.1 and are much better in mono).