I've also visited John at the Biltmore. Compared Focal, Sonus faber Nova III (one woofer), and the Wilson Sabrinas (not SabrinaX). He used the BIG Gryphon amplifier. I liked the Focal the least. It took a lot of listening to determine the Sabrinas were just a little better than the Nova III's....but interior designer girlfriend nixed the Wilsons as "too ugly." I think the Nova V's would likely have bested the Sabrinas, but he didn't have them available.
My opinion, FWIW, is keep the Serafinos and enjoy their excellent sound. It is easy to get into the "better speaker" quandary, and (again, FWIW, and from 50 years having stereos, and owned a store)) you will likely never obtain the "best" speaker in small speaker increments. If you were to make a big leap in price, you might get stuff that is better than the Wilson Sashas or Serafinos, but then the itch will hit again... At some point, it's worth just staying with good stuff and listening to music rather than to the equipment; I think you'll get the most enjoyment.