I own both, an O3 1k and an O2 busa, both with similar compounds. I can say that the gixxer is suprisingly stable in straight line high speeds and in turns, there are some sweepers on I-5 near my house and I have hit them riding both at 175-180 speeds and the difference in handeling is noticable, being a lighter and more rigid bike the 1K attacks the sweeper with more stability and accuracy, but gives up a little traction due to the lightweight, which leaves me sliding off line about a lane and a half before exiting the apex. while the busa on the other hand does not find the line as easily and takes more muscle to hold it there, but it will stay on line and will not slide due to the heaviness of the bike, the busa does have some worbeling or oscillation entering the sweepers where the gixxer remains true. in my opinion the worbeling is due to the flexing of the frame on the busa. also there is a point where the gixxer can corner at a higher speed due to the shorter wheelbase, where the busa will drag case the gixxer is not yet at full lean at the same speed, so in theory the 1K could go a little faster in the same turn cuz it has more lean? I wouldnt say one handles better than the other, I would say one takes less effort to ride than the other? matt mladin's liter bike has MORE HP than a stock busa and will totally blow away stock busa's in any situation with equal riders. my point being, HP plays a major role in the performance, handeling comes second, these two bikes may be to close to compare at anything other than top speed.