Two of my favorite are:
Jimmy Reed at Carnegie Hall
Albert King, "Born Under a Bad Sign"
These are some awesome blues discs. On the Jimmy Reed disc you feel as if you are in Carnegie Hall down to the room acoustics and the mic reverb, WOW!
The most drastic change though is still my REM, "Murmer" disc. The original CD was hardly listenable, the MFSL is great. I would say that it changed the way I feel about CDs. When m turntable when belly up in the eighties, CD had become big a year or so before an I ended up changing over. I could listen in my car and on the go, size, ease of care and so on. I bought the Murmur disc many years later, always regretting the swap to CD I did not expect much... I am still a little lamentful over the nostalgia of vinyl but now I am not missing it as much or at all. This was ALL because of MSFL! Now, with SACD and DVD-A, I am a happier puppy than in the last 20 years! If only Sony could get their marketing boys together and make it happen. I hate to think that this will be another Beta video thing!