Ducati is kind enough to rent the Spa-Francorchamps F1 track at least once a year. Marvellous place. Even the bigger bikes will run out of legs on the front straight, and those who dare can do the same through the last three turns.
The ZX is up to 12 now. I did have a ZX-11 for a couple of years. No class whatsoever, but an incredible sensation when you opened it up. Too bad it could only do it in a straight line. Somewhere in time I ended up taking a track class and decided I liked the corners better. So the big lug went out and I switched to supersports. Plenty of performance for the streets and much easier on the tires...