Master-9 
So what's the Master 9 beat and what's it close to or not as good as?
In the grand scheme of things, it would compare to the Rag. They have a different sound however.
The Rag has deeper / taller (bigger overall) sound-stage with more texture (almost "smoky" kind of sound). It is smoother, too.
The Master-9 is more on the super clean / transparent side, but not harshness. Very refined all across, too, but does not have the apparent smoothness of the Rag (from the amps I heard, only the Stratus had that apparent smoothness on first listen). Tighter and more impactful mid-bass.
Does not suck me in the music as much as the Rag, though. Did not try ACSS with the Master-7, yet.
A direct competitor would be the Taurus mkII -> I really did not care much for its sound at the last meet. Could be bad condition (LCD-2 felt so congested...) but I did not bother plug in my HE-6 that I had with me at the table... Not an inspiring first listen.
You guys have much more experience with tube gear than I do (I digged your amp and the Liquid Glass with HD-800 but was more focused on enjoying the sound than critically listening to the gear, ha!).
Feel free to borrow the M9 before I sell it to make your own opinion!