Keith, I would also venture a guess that you didn't use a SPL meter to ensure the volumes were set equally when testing them as the Dynaudios are 4 ohm speakers and the M22s are 8ohm so the Dynaudios would have out played the M22s regardless, unless set up correctly. You probably would have needed to turn up the volume for the M22s by a couple of points on the receiver.
I have the M22s and M80s and the M80s play the mids and uppers as well as the m22 but throws it out to the listener better for your larger room and the benefit of going to the larger floorstanders is worth the extra money spent, just for the much fuller soundstage the M80s produce. The M80s are a full range speaker and capable of playing down to 30hz, the sound difference is very noticeable.
