Ah, so you tend to disagree with those in Head-fi who think there's no difference between hi-def and, say, cd quality or flac, right? I don't have the money right now to spend on hi-def recordings b/c I'm saving up for November's K10 purchase. I tried to download from a free samples hi-def website that a member offered, but for some reason, can't at all get the X5 to recognize it. So...I'll have to wait on that so I can gain my own comparisons, Oh well.
I never even entertained the possibility that the K10 could be sibilant. What I just wonder about is, whether it could cure the sibilants I hear with my UM-modTF10. Also, I fully realize the diff between a well-mastered recording and the usual drip one gets from these fancy and complicated consoles that egomaniacal engineers like to foist on the public, lol. And... sometimes, it's also a matter of humidity and other conditions which would adversely affect the sound quality.
I know you are right about the K10, sq3rjick, we are destined to become a mutual admiration society, hee hee.