bah. I think blaming the recording is usually a lame excuse for phones that emphasize sibilance prone frequency ranges.
I don't buy it that recordings are sibilant, and the phones are just "revealing" what is already there. I think some recordings are a little peaky in the top end, but if you listen to a recording like that with a rig that is truly neutral, like a nice HP1000 rig, you can hear the peaky treble that is in the recording, like a pronounced "ssssss", but it still very rarely hurts your ears.
It seems that the vast majority of modern dynamic phones emphasize certain frequencies in order to make them seem more detailed, and then when a recording isn't completely, and absolutely beautiful, a peak in the recording combines with the peak in the phones and it just goes off the charts.
I've read so many people say that headphones can't be sibilant, that it must come from the recording. But this is over simplified, IMO. Yes, the sound that is sibilant is coming from the recording, but it is the headphones that are making a small problem worse. Or, in many cases, there are phones such as certain grados, that make gorgeous recordings sibilant. Try listening to Radiohead on a pair of SR125's and then tell me that it's the fault of the recording...