I'm definitely not as impressed by these high ISO shots as some other people. They look waxy, smeary, NR-ed to all heck if you ask me. The one shot a page back with the books was a prime example. At 25,600 it's clear all the detail of the ripped black book has been lost. And the daughter's classmate shot shows the same issue. All skin detail etc is lost.
*sigh* I really hope the ISO improvements over the MK II aren't all smoke and mirrors. I've not seen that many high-ISO shots that are that good, sadly.