Great musical CDP?

No, I haven't heard the CD5.
I have owned the CD3MkII for 2 years though, and loved it. I think it is one of the best CD players in that price range. Still is.
I listen to the same type of music as you do. Classical music was reproduced in full glory by CD3MkII. With the ARC players you need to run them balanced to get maximum performance.
Based on how good the CD3MkII was, I think we can make a safe assumption that the CD5 is a safe bet.

In my opinion, you don't need to spend anywhere near that much - get yourself a new or used Rega Saturn or Apollo. They are by far the best sounding CD players that I heard when I was auditioning several fairly recently, including the ones I heard in the price range you mentioned.

Not 5 but cd7 yes. Like it.

Still loving my Lector 7T

I can recommend the Modwright Sony 9100ES with Platinum Signature Truth Mods. Very musical, great vocals, and if you're really into classical, you shouldn't dismiss its SACD capability IMHO.