@atmasphere - No argument on the possibility of better sounding Class D amplifiers. I think some of the perception problem is due to the level of hype surrounding each new amplifier release, which peaked with those Hypex NC1200 amplifiers when several reviewers declared them "as good as Class A". They were not as good as the two Class A amps I owned at the time, Clayton M300s and Lamm M1.2 Reference. They did some stuff nicely including well-damped (maybe a little over-damped) bass, nice tone, macro impact, and smoothness, but compared to the amplifiers I have enjoyed most, they came out a little flat and uninspiring for $9K amps. I believe I once described the sound as musicians each playing in a separate room instead of a band playing together. There was something about the ambient sounds that was not coherent as it is in real life.
I would love to hear a pair of small, light amplifiers that overcome that issue. OTOH, my somewhat large heavy amps sit in one spot, don't bother anyone and sound great, plus I can lift them if I need to, so I have no reason to change anything.