I have owned several literbikes, most recently a ZX10R (though about 5 gens down, lol).
The GSXR1000 will feel quicker to you than a ZX14, until you become comfortable enough with the ZX14 to twist the throttle hard.
A late-model ZX10R on the other hand, is quicker at most roll on rpm levels and gears. Because it has darn near as much horsepower (some say more) than a ZX14, and is over 100 pounds lighter.
Having ridden literbikes in the mountains of western Maryland and Pennsylvania and West Virginia and Virginia (sweet memories of coming down out of the Alleghany mountains into Virginia onto 211 to Sperryville, with as many curves as the dragon and more vertical drop as well) I can say there is a huge difference between those and my ZX14.
My ZX14 is too heavy to dance on switchbacks. Which is not to say she won't go around them in good form and rapidity. Just not as fast or sleek as my ZX10R used to do it.
I'm finishing the route planning for a 3-day ride for my mc this summer. We are doing like 4 3-days and 2 or 3 2-days, plus all the 1-days stuff at least twice a month. Every senior member is "encouraged" to develop a multi-day ride each off-season.
For mine, I'm taking them out the old National Road (Rte. 40) from Hagerstown MD almost to Ohio through PA, then diving down 219 and other state roads to get to 250, and transition into Hwy 39 (arguably the best motorcycle road in the country, possibly the world - mountain passes, forests, meadows, steep drops off mountains, etc.) before ending at the motel for night one. Day 2 is just more of the same, ending at a motel over near Luray VA. Day 3 runs down out of the mountain onto Hwy 211 into Sperryville, where we will spend a few hours because 100's of bikers gather there after running 211. Then down and onto the Blue Ridge Parkway, headed north, to home around dusk.
I bring that up, because I will captain (lead) that ride, and my wingman will be very important. Because on my ZX14 there are hundreds of places on that route I will get so far ahead of the rest of the ride that the wingman has to hangback and talk to me over Scala, he will basically keep the ride on pace.
Because the ZX14 handles extremely well, and will flat walk away in the twisties from anything but a 650R or ZX10R or Ducati literbikes (and other bikes costing twice as much as the ZX14).
So throttle response on the ZX14? Scare you chalk white it will. Slide you back against the seat bump it will. Make you happy you are holding onto the grips tight, it will.
And while it is at it, it will sport tour in moderate comfort and handle the twisties well.
Its a different world, and I find it at least as fun as my literbikes have been, just in a different way.
Living the Gypsy Life