I haven't tried on the FZ due to my current traffic probation, 19 more days to go...however from my race days...I may not have been the fastest guy but I could get the holeshot every time.
The key is to keep the revs just over when the power band hits, ie: 7,500 to 8,000 rpm. During a fast launch the key is to keep the revs at 7,500 the WHOLE time by using the clutch. What you are doing is dialing in more throttle twist as you let out the clutch. Once all the clutch is out then you have the throttle totally pinned. Does that make sence? With your body you want to lean forward over the front of the bike to keep the front end down. If you do it just right your front wheel will just skim the ground about 1 to 2 inches in the air. Any more than that and you are letting the clutch out too fast. Wheelie = loss of speed.
Once you hit it, it is so fun! Just don't loop out!