First let me say that I am a big Sonus Faber fan. I own the Elipsa SE Red speakers. I had the Sonus Faber Cremona Auditors in my system a few years ago. I think they were the M version but can't say for sure. I was not impressed.
I have also heard the Olympica 1s at my dealer with electronics very similar to mine. I thought they were very good, especially for their price. The best way is to go hear a pair at a dealer. See if you can take them home for the weekend. If you like them you might even ask if he wants to sell his demo pair. That is what I did.
In general the older Sonus Faber speakers are more romantic sounding while the newer ones are more detailed and modern sounding.