My other bike is a Hayabusa, and yes it can feel a little gutless in comparison., but only a little.
Note that a Hayabusa and Rocket III have pretty much the same torque to weight ratio - the difference is how low in the revs the Rocket makes the torque, so it feels noticeably more urgent when suddenly rolling on from cruising at lower revs.
But when rolling at higher rpm, the Busa leaves the Rocket well behind.
The Rocket is all about getting up and going but falls flat after that, it never gets any better.
However the Busa has no prob getting up and going, just not as immensely sweeping as the Rocket does, but once up and going it gets faster and faster as the revs climb.