if i get it right, SA is more of a particular WAY to reproduce sounds. the samples themselves are probably as good/bad as anyone's else. but the way they are triggered and modeled is different. something like that.
now, i must say i am yet to hear a totally knok-out performance with SA voices, to lead me believe they are far superior.
i think korg's sounds are top right now.

of course, the tehnique of the player is the main factor. even an old casio's distorsion guitar sounds good when the player know how to do it. and lately, having so many sounds with different velocity-triggered samples, any of the manufacturers have quality voices.
so, are there some incredible demos for SA? links...

[This message has been edited by adimatis (edited 02-13-2008).]