Generally my thought on the M22 vs. the M60 could be described as "virtually identical" but with the obvious difference that the M22s are smaller and don't have the bass extension.
If you are trying to get an idea of how the M22s sound vs the M40, take the M60, remove some bass and plug your mind into the thought of a smaller version of the M60, then you will be set.

I guess that could be tougher to do than it sounds though...

"Those who preach the myths of audio are ignorant of truth."