Surely a CD ripped and loaded onto a server should not sound better.
Oh, but it can. Consider that a CD is playing in essentially real time. (I say "essentially" because many players sample at 4X, 8X, or even higher.) But a properly ripped CD using software such as EAC can re-read sections of a disc over and over again until it reads it perfectly. The software can identify any sectors of the disc where there were errors.
When I ripped my CDs to HD years ago, I was surprised at the number of discs that required extended reads to get accurate rips. Till, I'd still describe any difference between a CD and its ripped file as usually subtle.

