Firstly I will say that I have been a fan of Kawasaki KRT styling for many years but the Aprilia is my choice and if Aprilia makes an RS660-SPR 4 cylinder . . . Damn !!
This is incorrect. The ZX6R does not have an IMU and therefore lacks lean sensitive ABS, etc, it has only a rudimentary traction control system that detects rear wheel slip. The RS660 is the only bike in its engine class with a 6-axis IMU. RS660 also has an autoblipper, ZX6R has only a one way quickshifter
Aprilia cost 12.200 kawasaki 12.500 and more 30 hp .but aprilia have wheelbase 1370 more easily cornering .aprilia is perfect for track days the best for track track days. But i prefer kawasaki if i have to chooce between these 2
Why not a ninja 400 since that is two cylindre? Or would you compare it to a superduke instead. Compare bikes by price point and target buyers. Stop comparing 11500$ aprilias with 7500$ kawasaki ninjas.