With the 26" now available for $900 new, why would anyone spend the additional $450?
Maybe the 14bit 3D LUT and better sRGB sim mode (i've heard the factory sRGB on the 90 series was not nearly as good and something about how you can't adjust it either, not sure if that is true or not; if you ONLY do photos then that doesn't matter much though in any case).
EDIT: apparently you can adjust the sRGB mode, the white balance at the least, on the ^2 versions of the 90 series, it was only the original versions that you could not do so on.