Great review/comparison! Good read too

I absolutely love my Ninja 1000 and fully know exactly what you're talking about re the N1k.
This friggin bike is so fun to ride for that and the butter smooth throttle response and power curve. Piles of torque!
I have wanted a Ninja ever since the first one came out back when I was a teen. I swear this is the bike I've always wanted well over and above the Ninja name.
My timing was just perfect for the '11 Ninja model with this particular engine!
I would love to have a buddy with a Z1k so we could go out and do exactly what you've done! Too fun!