I have heard both in the last two weeks while demo'ing new speakers myself and they both sound really good. However, I prefer the Sonus faber sound myself. That said the fit and finish of the Olympica Nova are light years ahead aesthetically in my tastes and opinion. The Focal Kanta, though sounding awesome, have a big plastic-looking front that cheapens the look; where the Sonus faber Olympica Nova have beautiful woodwork and look like the expensive price you paid for them. That is just my opinion. If you have a more modern look in your room the Focal may be for you. They both sound great though.
Also, in full disclosure, I just bought Sonus faber and will be updating my system here when they arrive.