I have heard The Olympica II's and the Sabrina in adjacent rooms at a small dealer's show and there was no comparison. Both are lovely speakers and at the price the Sonus Faber are great sounding, but the Sabrinas on the end of ARC amps, which they seem to suit, were quite exceptional, room filling, detailed, very dynamic.
However and there is always a "however", the price is way outside my pay grade. I would certainly like a pair, but I will wait till they start appearing second hand, perhaps when the Sabrina II, comes out and there is always a II, even 3, with Wilson.