I'll be perfectly honest... given what I've seen of humans and demons, I'd be willing to bet that in a few years with enough practice, you'll surpass anyone who steps up to you. Humans are a unique breed. They continue to thrive in spite of a universe that's bound and determined to keep them near the bottom of the food chain.

In fact - no offense to Goku or anything, he seems like a generally great guy - but I think I'd rather spar with you.