I thought the M20s were slightly better than the M22, and the M105/106 is also quite a bit better, but also a lot smoother due to it's slightly lower focus on being as neutral as possible. That said to me Revel speakers tend to all have a bit of hash in the mids that struggle with bright recordings, but are pretty much superb with everything else.
I think one poster here mentioned that the Revel M105/M106s were pretty close to the Dynaudio C1s. I own all three of these and I think it's actually not too farfetched of a claim (asside from the fact that the Revels dont have bass extension anywhere close the the Dynaudio), until you throw bright recordings at the Revels. Then you start hearing the cone breakup modes quite audibly.