I have never heard K10, I will sell my Roxannes because I cannot manage a good fit even after several reshells. The Roxanne sounds good, great size of soundstage and well controlled bass. The SE5 Ultimate is significantly better to me taste, the sound feels more natural, and layered. I don't know what it is with the Roxannes, can't really point it out. I tried the Layla briefly, seem good.