I was extremely excited about this bike ever since I heard the rumors a long time ago. i currently have a 2017 ZX6R, but the most fun I have ever had on a motorcycle was my Ninja 300. Being able to wring it's neck on the street without going 90 in first gear was a blast, but at the end of the day it had poor suspension, poor brakes, and I wasn't about the parallel twin life. I went through many bikes since then before finally getting my dream bike (the 636 before I knew the ZX4R was a thing). Then I found out about this bike and it was like the heavens had answered my prayers and gifted us with the perfect bike.
However. When I saw the price, suspension, frame, and weight I questioned what Kawasaki was doing. I was expecting this to be closed to the Ninja 400 price, maybe 1k more since it's a "race bike". A ninja 400 is $5.3k, a 650 is 8k, and a ZX6R is $10.6k. I thought the ZX4R would be around $7k at the most, but for the price they are asking I'd much rather just keep my ZX6R. Very disappointed, but I can't really complain cause I have a bitchin bike.
Edit: Regarding my use case. I don't track, hell I don't even ride hard in twisties. I've always loved the sport bikes for their looks, sound, riding position, etc. They make me feel like I'm on a rocket vs lounging on a sofa. I know there are many who will give me shit for not using a race bike "how it's intended to be used" but they can all pound sand.