I to0 have only heard the RC-70 in FS. The 70's are a nice speaker for most people and when on sale, are a good buy. I would really like to do a better comparison in my home, but I think my wife would kick me out for doing more comparisons right now. I do remember thinking the 70s were not as detailed or clear as the Axioms I own. I seem to think this alot when I listen to other speakers until I listen to the higher end line ups.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70