It is just always noted that the M2, M22, M60, M80 sound similar for a better tonal match. I have heard the M3's and they are somewhat muted compared to the rest, then again, I find the M60s a bit muted compared to my M22's or M80's

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