Gvickerschtick, Like amps of all other types, class D amps vary in performance, tembral signature, and price. . . it is difficult to make a broad-stroke statement on how class D sounds any longer. One common trait is that they take a very long time to break in, and before complete break in at about 1000 hours of music making, they can sound rather dry. . . or at least rather odd. Audiophiles who seek a modicum of tube bloom have successfully paired class D amps with tube linestages and front ends. As I prefer a more neutrally approach to musical sound, I have recently gone completely SS with a JRDG 312 and a JRDG Capri linestage and couldn't be happier. . . . well, until the next upgrade. . . you understand (grins!)
Seems to me also that like with most other technologies, power cords, ICs, and power conditioning may have a significant effect.
The bottomline answer is that class D can 'sound' in many different ways, including 'sweet', provided the software and the rest of the system make it so.