You'll certainly get more and deeper bass output from the M80v2, especially in a larger room (2500 cu. ft. and larger) and a bit smoother midrange.
Before I retired from Axiom, I heard several later versions of the M60, which were quite excellent, a big improvement on the original M60ti, which I never cared for, mainly because of its sibilance on female vocals and aggressive upper midrange on brasses and horns.
I don't recall hearing the M60v1.
The M80v2 was greatly improved from the original M80ti, which, in its earlier versions, exhibited the same midrange brashness and aggressiveness as the M60ti. The later versions of the M80, including the v1, eliminated those faults, and the M80 became a wonderful neutral loudspeaker.