Hi and Welcome Bart,
I also A/B'd M60s against my buddies almost new Paradigm Studios within a month of buying my Axioms. They are indeed very, very similar sounding. My buddy and I tried to fool each other by blindly switching the cables for the other as best we could. It took us several tries before we could start to accurately identify one from the other. I'd like to try this again some time now that I am a bit better informed about what to listen for.
In any case, I think you won't go wrong with either set. The only conclusive thing we determined from our listening test is that my buddy was disappointed that he could have had the same sound for less money. However, he is very happy with what he has, as am I.
