I was referring to the original GPZ 1100 from the 80s, air cooled 2 valved 1089cc engine. The one you were referring to was a completely different GPZ. In 1995 Kawasaki brought back the name and stuck a de-tuned ZX11 engine in it. It was intended as a sport-tour that didn't have the ram-air, smaller intake and exhaust numbers. I forgot all about that version, they only make it from 95 to 97.
The ZX14 is intended to be the fastest motorcycle on the planet today, not a road-racer. They have the ZX10R (which is BADASS) to fill those shoes. When land speed racing and street riding you need some weight for stability. A 470 lb. bike is perfect for that. You have to see the ZX14 up close, it looks better in person.