Depends on what kind of Sonus Fabers you have in mind. The Grand Pianos are probably the starting block in their high end stuff. They are highly efficient, beautiful sturdy speakers with spot on dynamics. Clear crisp highs and tight bass. When paired up with the right source and amplification they are unbelievable. Planars usually have a more mellow sound with better staging. They require much more space and are demanding in their power requirements.
I vote for SFs any day.
I vote for SFs any day.