John, Only one way to really find out, that's to dem it yourself. After a recent bake off, I'd suggest you trial both a Quad 99 and CD5i. Overall I'd say the Quad was slightly better, though personally I prefer the style of grooviness of the CD5i. The Quad was more natural in timbres across the frequency range. So it's probably worth finding a friendly dealer and going for a comparison in the shop against your SACD player. Bearing in mind the cost, try to also take them both home to check them over. Personally I found it all too easy to only spot how good the mid range was on the SACD, and only picked up later on how boring it was to listen to, so an extended test is worth doing.