Did you compare on RBCD? The Puccini falls noticeably short compared to the XDS1 there ime (no opinion on SACD as that's irrelevant to me - software selection too limited).
Also, make sure you are using the 102_002 firmware (November 2009) on the XDS1 as anything before that isn't a good indication of what the XDS1 can do.
Also, make sure you are using the 102_002 firmware (November 2009) on the XDS1 as anything before that isn't a good indication of what the XDS1 can do.