Gotta say, these are awesome. I'm not an audiophile by any means (only thing I came close to was owning a M50 several years ago), so I have no idea about the technical jargon, but they sound fantastic and are very immersive. Super, super comfortable too. Using them to listen music from my PC (without a dedicated sound card). I won't mind paying ~10k for them, though I'm glad they I only spent 6.5!
Someone posted this on Amazon, the only thing I regret is that Sennheiser did not provide a case/cover for them.