Twl, The SCD-1 has a leg up because it is an excllent CD player that happens to also sound excellent with SACD.
SACD is not the clear winner over redbook CD. That conclusion, as always, depends on the quality of the recording and the quality of the music. There's good and bad SACD software and there's good and bad CD software.
SACD has never bowled me over (it kinda sneaks up on me) to be the clear and distinct winner in a format war. Of course, the same goes for analog verses digital. There's good analog, and there's good digital.
Everything (the recording, the format, the music, the equipment, speaker placement, the electrical supply, the room acoustics, the listener's mental state at a given time) has to do with the quality of sound reproduction.
Just like you said, garbage in, garbage out. Cheap analog will sound like, well... cheap hi-fi analog and the same goes for digital.
-IMO