Yes I owned the AD2000 for a while, but that was a long time ago.
I didn't like them, I preferred the K701, so I sold them again. I found the AD2000 did weird things with imaging and was just "too much of everything" for me. They are on my second chance list though, if the opportunity arises.
As I remember it the Kenwood has a more substantial sound and less airy / extended highs. The mids of the Kenwood are a bit more forward, I like it better this way. The overall balance of the Kenwood is just way better.
The Kenwood sounds natural.
One of my criteria is the sound of applauding people. With the Kenwood it sounds like clapping hands and not like static.
I HATE the K701's, I've owned them twice, and I couldn't get used to the fit, nor the sound. The AD2000's should be arriving here shortly. You're not in the US, are you?