Yup, Mick, I agree... the GSX would feel quite a bit more powerful in the lower and mid range. They're real close in HP anyway, so torque is what you're feeling... But you're limiting your opinion with your comment "but I can tell ya first hand, the gsx14 will out pull just about anything and everything".
I'd put a huge bet on the Hayabusa or ZX12R, if you paired either up with the GSX1400 or the B12 and win the bet hands down... There are stock bikes that have been on the market for a while that will kick the GSX's butt...
Anyway, notice the dynos below --> the difference in torque curves at 4-6000rpm... There's where your seat of the pants feeling is coming from... as you can see there's quite a difference in the torque at those levels. A stock B12 at under 80ftlbs torque just can't compare to a bigger bore bike with 90ftlbs... Until the HP in the B12 starts trying to make up the diference in the upper rpms (above 6500rpm)...