Alas, for emissions control they had to go to water cooling for tighter bore clearances to comply with exhaust emissions at cold start up - and they got heavier and slower while doing it and took years to get back to the same weigh and power levels, it's well documented.
My GSX1250FA is watercooled, fairly large capacity, not terribly powerful (HP) but is very smooth and torquey. It's the nicest bike I've owned and can't get the silly grin off my dial every time I ride it. :)
Laurie