Like I said, it makes up for torque with hp up top. It probably doesn't feel like it pulls as hard as the busa for 1 reason...they make power at different RPM's in different ways. If you look at dyno sheets you'll see that the Busa makes more power and torque down low (about 5-10rwhp) but up top in the high range, the ZX passes the Busa's power then holds peak till revlimiter unlike the busa which starts to drop off just before redline. The 12R is a revver, the Busa is a puller. When both are in the highrange of their powerband, the 12R does indeed pull harder, but cruising around down and hitting it from 6 or 7k...you're naturally going to get more pull from the Busa.
Here's an example...my dynochart. Check out the red line (N/A)...holds 175rwhp from 10,000rpm to the 11,750rpm revlimiter. Also 150rwhp at just 8,250rpm. So in 1,750rpm..the bike jumps from 150rwhp to 175rwhp! That's where the 12R makes it's power. Keep in mind, my motor is 100% untouched! Just a pipe and remap!
Most Busa's with the same mods make around 168rwhp SAE...but get to 150rwhp at around 7,500rpm. After 10,500rpm..the Busa loses power and falls on it's face dropping down to around 160rwhp while the ZX is still singing it's 175rwhp tune all the way to revlimiter at 11,750rpm.
Both massively powerful bikes...but they make their power in different ways and places. Busa is more of a catapult...ZX is more of a rocket. It's a matter of quick vs fast.