What class of amplifier has the most high definition sound ?

I would say that Class D and Class A tube amps (excluding OTL) have an opposite sound signature. 

Tube amps add some meat to the bone.

Class D amps take some meat off of the bone. It can come off as crystal clear, defined, and completely quiet between notes (inky black) but to my ears that sound signature is the result of removing a tiny amount of the music from the source. My guess is that its a product of the output filter, a tiny amount of the good leaving with the bad.  

If my SEP (that's right, P!) amp is being strangled by the output transformers (or is it the input transformer acting in a co-strangle mode?) it must be consensual and a good thing somehow as it's the best sounding amp I know of, or certainly have ever heard in my various systems over the years. Good job transformers, whatever the hell it is you do...

This thread,
Pit of misery,
Dilly, Dilly!

Good job transformers, whatever the hell it is you do...

They provide the even ordered harmonics (distortion) that makes tube amps sound so nice. 

I'm pretty sure it's the tubes that do that, as it's been claimed the transformer's job is to strangle things. You have to pay attention around here.