How much horsepower does a Kawasaki ZX-4RR have?

Excuse me, could you please elaborate on the horsepower specifications of the Kawasaki ZX-4RR? I'm particularly interested in understanding the engine's output capabilities and if it aligns with the performance standards typically expected of a sports bike of its caliber. Is there any notable change or improvement in the horsepower from previous models, and how does it compare to its competitors in the market? Thank you for your assistance in clarifying this detail.