schwartzkm,
one of my two regular riding buddies has a Fazer 600. I have ridden it several times.
It is chaulk and cheese with a Sprint.
As with all 600 fours that originate modern sports bikes, it is a potent mill that spins very freely but to ride fast you will be dancing on the gear lever, very little torque. It has a stunning top end rpm performance for a little 600 as they mostly do these days.
The Sprint has an incredibly smooth engine through out the rev range and will pull from 2000rpm it has a sweet spot from 5000rpm onwards.
The Sprint has a very healthy dollip of torque everywhere. Nothing at all like a Fazer.
The Sprint you more sit into rather than on top of and the Sprint has a more leaning forward stretch to the bars than the FZ6.
cheers,
Davem
