Got my KC06A last week and been using them for more than 100 hours already. Without any hesitation, I say yes they are better sounding overall than DN1K. IMHO the only area that DN1K were not beaten by KC06A is in 3D imaging, soundstage and treble quantity. Everything else is taken by KC06A. Although the Dunus are slightly better in clarity but thinner in mids presentation. I prefer the thicker and fuller mids of the Ostrys.
They blew the GR07 BEs out of the water. IMO, they are an upgrade if you're coming from the BEs. They have better bass response, texture, more rumble and can go deeper. BEs mids sound veiled compared to the Ostrys. The BEs have more treble quantity and well extended but prone to sibilance while I can not detect any sibilance to the Ostrys, they also have good treble extension. If KC06 made the BEs sound boring to me, the KC06A made them lifeless in comparison. Of course, YMMV.