The great thing about getting to a happy place with your system, at least digital replay, is that it is a rare CD that sounds bad. As digital matures, more information than we ever thought possible gets pulled out of those pits. I recently randomly pulled two CDs off the shelf that I hadnt heard in years. The first was a Sony issue, early digital, of the Schuman PC and Quintet with Rudolf Serkin as the Pianist. Always loved the performance but was utterly blown away after not hearing it for a few years at how stunning the sound was. OK, the treble hardens a tad when pushed, but certainly amazing for 1959 recording. The second was a Naxos CD of the Beethoven and Mozart Piano and Wind Quintets and the Mozart "Glass Harmonica" Adagio as a throw in bonus. Again, my memory of most early Naxos issues was that that they were dry and not to sonically appealing, but this sounded magnificent.
I really treasure my SACDs, Blu Rays and High Resolution downloads, but even plain vanilla Red Book CDcan sound so good as to be completely satisfying