how do they compare to Kumhos?

I think you're talking about the A032 R and H? series?
They have a specific compound for road racing and auto-x, the people i know who have used them both (both compounds), alwasys had a complaint about them. The R's would get greasy, and the Auto-X compound had numb steering..

I have run them, the harder compound.

They are very progressive tires... and have a long treadlife, sacrificing some grip.

Aside from being noisy, I dont really have any complaints on them. Good tire for introduction to R-comps.

I borrowed them from a friend, that borrowed them from another friend. I think they have three seasons on them, and could go another. :D

how do they compare to Kumhos?

not good
even the victoracers work better as an autocross tire

I'm not sure the yokos are much better than azenis even.