All depends on the rider. 04/05 ZX10's trap 140mph witha 200lb rider JUST LIKE A BUSA...
Ask GeorgeC - he has both and in 95heat / 95 humidity he trapped 143mph on a 2005 ZX10R with slip on and u4. His Busa never trapped that mod for mod...
I'd have a hard time believing that, having the actual time in the seat versus that exact bike that I do. My buddies 05 ZX-10 never even tied my Busa, stock for stock, even when we switched bikes,
in a straight line. In fact, even though I say we're close in weight, I'm a bit heavier than he is, by about 15-20 pounds. And, the torque down low is incredibly different. Whacking the 05 ZX-10 from 3-4K, it felt like a toy compared to the Busa. Gutless until it's wound up. Great track bike (way better than a Busa, and the track is where I do my high end riding as in, road race) but, please, let's keep our perspective here. I've run against half a dozen 04-05 ZX-10's at the track. They do NOT keep up with a stock Busa if they are stock as well, again,
in a straight line. The 06 and up ZX-10
may whack a Busa in a straight line but, the 04-05 will not.