Everybody knows Yamaha and Honda have the R & D departments, and the cash, to build whatever they want. They make great bikes. But they always tend to the conservative side when it comes to all-out performance. Anyone buying one of those, who wants it to have mind-blowing performance, has to do a lot of massaging in the aftermarket.
Kawasaki and Suzuki have always been the testosterone bikes. Kawasaki clearly had the upper hand in the 70's, and it seems like Suzuki has taken the upper hand today. It is kind of like the AFC and the NFC in the NFL, which one is the better conference. The pendulum swings back and forth.
But the guiding philosophies of the corporations seem not to change. Honda and Yamaha always seem to hold back on all-out performance. Today, the truth is that Kawasaki has slipped into the number two spot, in sport motorcycle performance. In another ten years, that might change again. But I see Yamaha and Honda continuing to produce the same basic kind of sport bikes they always have.