It would be nice if we had the luxury of swinging the vote one way or another based on price, but that, too, is impossible, as they both retail for $9799. Chassis performance has to be the deciding factor. Both offer very refined and updated suspension, but the ZX's Showa fork impressed us more than the 675's revised Kayaba. It suffers less dive under hard braking, while offering the bump compliance of a softer setup. Because the chassis doesn't pitch back and forth as much between braking and acceleration, the bike is more poised. Another big plus is the Kawasaki's excellent slipper clutch, which improved composure during fast corner entries while downshifting. All of this adds up to more rider confidence and faster lap times.