your opinion? Sonus faber Serafino Tradition vs the Focal Sopra 3

Focal all day. 

Focal will most certainly be more detailed. Some hear may hear excessive brightness. System/room dependent. YMMV

SF will have a subjective "warm/romantic" personality compared. Have not heard Serafino  but MANY others, assuming it follows the SF "sound."

I like both presentations. Prefer SF aesthetic.

The Italians taught the French how to cook. They have an aesthetic sense that is hard to overcome. Sonus Faber all the way! Compare a Ferrari to a Citroen.