I still don't think the best class D amps are as smooth and holographic as the best tube amps, but they are getting better.
IME as long as you have the right amp, class D can be every bit as liquid and smooth as the best tube amps. But you have to hear the right one; like the way tube amps can sound really different from one to another, the same is true of class D (or class A for that matter...).