They are impressive. The only headphones that have made my jaw drop this hard was the D7000, HE-400, and HD650 (with it's mids). I always find problems with headphones. Like the HE-400 having a bit too much treble, or the HD650 being a little slow for certain genres, that keeps them from being as amazing as they could've been. The Annies... just... I honestly can't find anything.
I'be really interested in a in depth comparison between the K702 and HE-400.