Good question. I'm not sure. Kawasaki is known for making some of the fastest mass produced japanese motorcycles. They once were "king" of the sportbikes, but I think it's fair to say Suzuki took the crown, but it's a hard crown to keep.
If Kawasaki wants it back, the ZZR1400 may just be a winning ticket.
NEW 2019 Motorcycle Model Guides
2018 Motorcycle Model Guides
Total Motorcycle is official Media/Press for Aprilia, Benelli, Beta, Bimota, BMW, Brammo, Buell, Can-Am, CCW, Ducati, EBR, Harley-Davidson, Honda, Husqvarna, Husaberg, Hyosung, Indian, Kawasaki, KTM, KYMCO, Moto Guzzi, Moto Morini, MV Agusta, Norton, Phantom, Piaggio, Polaris, Ridley, Roehr, Royal Enfield, Suzuki, Triumph, Ural, Vespa, Victory, Yamaha and Zero.