I'm under same trouble questioning.
I have a Z1000 and thinking what would be the next model. So started test ridding them.
Yamaha R1 - crap, feel that you are going to loose front wheel every curve, didn't like riding position, instruments... hate it.
Kawa zx10r- great sound, handles very well , abs ( you can not lock that rear whell). ..but I have that muffler( horrible ).
Aprilia 1200 dorso duro - supermortard, great on curves, any gear the front will lift, kinda off on the heavy side, but wonderful engine, abs as well.
MV F4- handles very well, good punch but too loud to me. I don't like the idea of using ear protection to enjoy my bike...maybe I'm getting old.
Duca 848 - that is the bike that I'm going for, great handling, power, design, what can I say. just perfect, if I have money would go for panigale but not enough cash.lol.
to make short, I think you should start test riding and take all bikes to the same location under same conditions, therefore you will be able to compare and decide. I would also finish with 2 potential bikes and test ride them again.To final comparer, riding style, equipments, fuel comsuption, parts and acessories price and maintenance.
I hope that helps.
cheers