I test rode the 2020 Ninja today, apparently I was probably only 2nd person in the country to do so
I turned up at Bournemouth Kawasaki just at the right time to have a look and got to take it out for an hour on trade plates.
I can only compare to my 2015 cos I haven't ridden models in between, but can report as follows.
Engine seems smoother than mine and controls feel lighter, seat is as comfy for my 12 stone as my Sargent is. TFT dash is superb as is the QS. Exhaust is ugly but actually sounds great at higher revs, other than that, a stunning looking bike.
I am tempted but my bike (mint 10,000 miles tourer) plus £6.5k is tough to justify, add another grand for sport package and it becomes even tougher.