I rode the FZ07 at my local dealer and was not impressed with the overall package when comparing it to my 2007 Ninja 650R. The FZ07 may have had a bit more power but the rubber mounted bars led to vague steering feel and the vibration through the rev range was terrible.
I have yet to ride a Z650 and have been trying to find a Demo ride to get some seat time.
I really like how my 07 is set up right now (Ohlins shock, Versys swingarm, Emulators up front and soon to be replaced with ZX10R forks) and to a point that gives me a lot of bias when I am riding a stock bike. But I really would like to have ABS for my long distance and sport tour rides.