The KTM690 delivers around 70 engine brake horsepower; the manufacturer claims 305 pounds dry weight.
Out-of-the-box, I imagine the KTM beats the, "World's Fastest KLR," run at the Texas Mile and at Bonneville. I'm close-to-certain the KTM will win a drag race with ANY KLR.
The, "World's Fastest KLR," has EVERY hop-up option applied, sparing no expense. Getting another 20 HP out of a basic, "sow's ear," comprises a hard row to hoe, IMHO; YMMV! And . . . the WFKLR can be ridden legally ONLY on a closed course.