No, I hear it. And I hear something weird on 'T's too
But I found it was worse with some tips than with others. I've just ordered some other tips in the hope it might sort that out, or at least make it less obvious. Even with the slight sibilance I can hear, I still enjoy the rest of the sound signature a LOT. I see that some others aren't experiencing sibilance at all, but I can definitely hear it. No idea why some hear it and some don't, it's just one of those mysteries...