I changed from my trusty old Bsnd 3000 (now with parents & playing through an MX) to a new (white!) BSND9000 around 18 months ago.
The CD player is linked into an Avant/Blab4000 AV set up, and nothing else changed in the setup - including the ML cable.
I noticed a marked improvement in "fidelity", for want of a better word. Better seperation, and more depth / detail etc etc. It is, without question, an upgrade.
Could be that the BSnd3000 had just got a bit tired, but its never missed a beat in terms of palying discs, and it has played OK since moving to my parents place.
So that suggests to me that a Bsnd9000 is a worthwhile upgrade over an "older" player. How it would compare side by side to a new bsnd32000 or Bsnd 4 I don't know.