Hey |joker|, I got my CK100's today my dear friend, and re-read your full review, to which I couldn't personally find any room for disagreement. They certainly make a clear-cut distinction between mid-centric and mid-forward. As you mentioned, any and all personal gripes I had with the CK10's treble is nonexistent with the Ck100's. I must admit however, my sole intention in purchasing the CK100 was with one thing in mind; the added Zo effect. I'm no longer hearing the CK100's however; thanks to the Zo, I'd dub them the CK101, and the added 1 is no small feat. They're beginning to sound much more on the warm and sweet side, with the impeccable midrange taking priority above all else. Initially, I was worried that coupled with my FiiO E7 + Zo combination, I wouldn't do them justice. Even still, I can't say that I have, to be quite honest, but owing to the fact that I'm not hearing much different from what you've described, I'm content. Now, once I've allowed myself a few days time to become accustomed to their sound, I'll see where the CK100 stands in comparison to the K2 SP and EX1000.
P.S. As was the case with my SM3's, low volume listening has never been easier.