Hard to make a honest comparison since the valid one is with the original Vitus Carbone 3 vs. the PY-10FC. What I have is the Carbone 9 with the Kevlar/Carbon tubing and of course, the rear is carbon, too. So the Carbone 9 (which literally just rode this morning and am... in love!) is quite different and as stiff and responsive as you would want BUT with the wonderful resilient alloy fork. So in the end, they are pretty much equal. But I suspect the PY-10FC is rather stiffer in feel and ride to the Carbone 3 with the original plain carbon tubing.
What I like about the the Vitus frames is that they LOOK entirely traditional and "old school" with the conventionally sized tubes etc. The PY-10FC reminds me more of my Masi 3v with the oversized tubing... which works visually very well in the larger frames I ride.
Peter Kohler
Washington DC USA