I'm sure Peter will pop in sometime soon, but I lived with his Monitor 9s for a while, and now live with the M22s, so I'll offer my opinion.
The M22 completely blows away the Monitor 9 in every area except bass response, which is a given considering the difference in size. The M22 has
much better imaging, a more cohesive soundstage, more detail, and is more neutral than the Monitor 9. In the short time that both the Monitor 9 and M22 were in the house, the Monitor 9 sounded a bit slow and veiled in comparison.
Now since it's basically general consensus that the M60 shares many of the M22's good traits and on top of that adds good bass response, I don't doubt that the M60 also blows the Monitor 9 out of the water.
