I just started to mess around with DSD and downloaded a couple digitized albums from RuTracker. Kill 'Em All and …Nothing Like The Sun. I have heard may versions of both but they have never sounded better. I was really surprised, it was very noticeable.
Much of what I have on sacd isn’t available in other digital formats in higher than CD resolution, and often there are no other multichannel versions available period. But as others have said, it’s mostly about the mastering process.