Yep, working on that now. I'll write up some thoughts when I'm done.
So far it seems like minor but worthwhile changes - character is the same, just a slight improvement with the R version. Which is impressive because the original is already so darn good.
The single CMA800R with DA8 is a fine combination. Slightly less detailed than Questyle's own CAS192 DAC, with a bit more musicality and "bounce" for lack of a better word. I enjoy the pairing very much. Can't yet say how dual CMA800R would improve on the situation.
According to Alden at Questyle, they are working on an updated version of their CAS192 DAC to include DSD. This should also make for an interesting partnership with the CMA800R. Up to now, I have tried the CMA800R with the Eximus, Naim DAC and the recent Teac DAC. Impressive listening with all three.