I agree in part to both albau and Confispect. As I get more into this hobby, I am learning to let go of the "one size fits all" attitude in terms of finding a headphone that does everything well, and learning to appreciate each headphone set for its strengths and unique sound signature. Despite its shortcomings, there have been many times where I've simply been wowed by the CZs.
To Confispect's point, I agree - there are many intervening variables in the audio chain that modify the overall listening experience, such as quality of source and "different ears." In terms of the latter, I've found my ears to be quite sensitive to high pitch noise. A while back my friend and I were listening to a story on NPR about that new device that plays a harsh high pitch noise to scare away nucklehead teens. NPR broadcasted the noise on air - I was able to hear it pretty well, but my friend said it was barely audible to him. Were both in our late 20s. Anyways, I think my sensitivity to high pitch noise may be reason why I am so bothered by the CZ's sibilance such that they are unbearable/unenjoyable on certain songs.
Daanish, I would love to hear your impressions once you get your tips.