Yes very different, both have there place and both are fun to ride.
There is a massive weight difference of about 115kgs which makes the ZX so much nicer to change direction on and the brakes on these things are fantastic, much better than I remember my ZZR11 ever was.
My harley revs a bit past 5k much to the surprise of some, this one hits the rev limiter set at 6700, lugging a harley motor at least the current twin cam motors is probably the worst thing you could do to them.
But nothing beats being able to just hold it on and keep changing up gears like a reving kawaka.
Hopefully get a chance to find out how much difference in ET in a month or so.