Torque Comparison
Yamaha FZ1 (Blue) - Honda CB900 Hornet (Green) - Kawasaki Z1000 (Red)

Here you can see that Yamaha's FZ-1 has the torque contest won hands down. 

The Honda CB900 Hornet is significantly stronger than the Kawasaki Z1000 in the important lower and middle ranges.  However, the Kawasaki does take over when the revs reach around 9,000rpm.  On the road the Kawasaki is not helped by overly tall gearing which really makes the lack of torque at lower revs even more apparent.  Things improve markedly for the Kawasaki after changing to a one tooth smaller front sprocket, this is a must do for any owner. 

The Yamaha is also quite tall geared but has the grunt to pull it.  Serious hoons would consider changing the gearing on the Yamaha though to add even more spice to the package.  As standard the Yamaha will wind its 280kph speedo off the clock with one gear to go when on the dyno.  Of course in the real world this would never happen due to aerodynamic drag but it does illustrate the tall gearing of the FZ-1.

Power Comparison
Yamaha FZ1 (Blue) - Honda CB900 Hornet (Green) - Kawasaki Z1000 (Red)

Again the Yamaha wins everywhere when it comes to horsepower.  The Honda is not far behind until around 7,000rpm where the FZ-1 builds in to a sportsbike impressive top end. 

The Honda has significantly more poke than the Kawasaki in the 5-7,000rpm ranges but starts to run out of breath around 9,000rpm.  This is the where the Kawasaki starts to hit full stride and achieves a peak number 14hp greater than the Hornet.

NB: Both the Honda and Yamaha had the benefit of aftermarket mufflers while the Kawasaki did not.  So some further top end improvement could be expected from the Kawasaki with some good quality aftermarket mufflers.  However it is extremely unlikely that it would claw back much of the ground it loses to the Honda in the lower and middle ranges.

From Left to Right
Kawasaki Z1000 - Yamaha FZ-1 - Honda CB900 Hornet