I have "A Hard Rain" Greatest Hits on redbook (a gift from EMI).
It'll be interesting to see what you conclude. That particular SACD has received uniformally bad reviews. Keep us posted.
make sure you listen to the Japan HDCD remasters from 1999-2000 for the same tracks, in HDCD. If you don't have them, they are well worth buying anyway.
There are two tracks in common between Roxy Music Greatest Hits and Avalon, so that's another comparison.
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