What I think - all the race-reps in the liter class are fine bikes and the performance differences so minor as to be negligible. Rider skill is most likely to determine a winner in a race between them. I haven't riden any of them myself, so I can only go by what the media says. From what I've read, the 1K Ninja is the most nevous of the bunch. It doesn't come with a steering damper - and for most riders, could seriously use one. If it was me buying, I'd go for the R1 because I think it's the best looking of the bunch - that, and I'm more partial towards Yamahas and Suzukis than Kwackers and Hondas. I think you should buy the one that speaks to your soul the strongest, regardless of what anyone says.