You might get more opinions in the Sonus Faber owners thread....http://www.avsforum.com/t/1099570/sonus-faber-owners-thread
I'm not to familiar with the Cremona M speaker, but I will say that the sound signature of Sonus speakers is on the warm side,
yet well defined & non-fatiguing . I've heard B&W 800 series speakers, and to my ear, they have more of a neutral sound (detailed also).
It all depends on what you like as a listener. I have a Sonus Faber home...