It's hard to say... I have M60 mains in the HT and occasionally swap in M2's when doing demos. I'm always amazed how good the system sounds with M2 mains and a couple of big subwoofers, but pretty much everyone other than me says there's no comparison between the two and that the M60's sound much much better. I set the cross over to 100 Hz when switching between M60 and M2 so guessing the difference is distortion level rather than frequency response.
M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8
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