I have a MT09 (FZ09) and a Kevtx 02 sensor kit improves the throttle response heaps, it is not as snappy so the issue is in the fuel map, the other issue is the amount of torque the bike has right off idle.i test rode a yamaha fz07 which includes fly-by-wire. i didn't like it. takes a moment to respond. i didn't want to buy a bike and hope i'd "get used to" it.
iirc, yamaha is still having some trouble with the fz09 throttle, but they managed to fix it on the fj09. go figure.