It's funny, I've posted a lot more in the Tenore thread even though I like these better. At first I found KC06 way better, but I learned later that I was getting a bad vacuum seal on them which affected it sound. Now, I like them both but they have different purposes in my opinion. If vocals are important to you, you can't go wrong with KC06. In general I would say that with KC06, everything sounds close by. The bass, the singer, the drums, the instruments.. it's like they are right there, next to your ears. With Tenore, you're getting a more realistic sound, a dimensional sound where you might imagine them on stage, some further from you than others.
Again comes down to personal preference so I try to be as neutral sounding as I can about this. I use the following description to describe to the two different sounds:
Imagine a band is in the studio recording their album. For Tenore, you're sitting outside with headphones on where the producer is sitting. He's fiddled around the mixer, and has hit the Record button and you are listening to the song the way he wants you to hear it. It's a smoother, more polished sound. You can hear the fullness, the overall sound the way it was meant to be heard. For KC06, you're on the other side of the glass, inside the studio the way the artist is hearing it. It's a raw sound, there is a lot less dynamic but every instrument and audio source is right there for the taking.
I love both sounds, but I love the rawness more for what I listen to mostly. So for me it also comes down to genre. If listening to a soundtrack or some classical music, I prefer listening with Tenore. I find they do Rap quite well too, R&B is a bit of a wash, depends on the artist. Pop/rock, if I'm listening to Coldplay, Kelly Clarkson, Mariah Carey, or U2 then I prefer KC06 because I want that vocal rawness. Anything with acoustic guitar sound amazing with KC06. EDM seem to work well with either one. I'm *guessing* country sounds better on KC06..