I spent a couple of hours in 2 channel on Monday night playing Redbook CDs, Alan Parsons Gaudi, Supertramp Crime of the Century and Steely Dan Aja. I've probably got 20-25 hours total on it. The interior detail on fundamental notes is pretty stark. Before I'd hear the note or riff, the instrument and it would be good. Now I hear that plus the nuance from that particular recording session, whether it be fingering, fuzz or filtering. Also detail buried in cords is brought forward so that ensemble playing sounds like there are more instruments contributing than before. Lead vocals seem to be brought forward and background vocals recessed...meaning imaging is placing the background singers behind the lead on stage (at least on the AP disk...SDs singers were setup slightly different). All in all, SDAs have always made studio recordings sound live. Now they sound "liver".
vc69, I heard an edge to vocals initially too...now it's smooth as silk.