I just got a used pair of the K702 65th Anniversary Edition. I've never heard anything from AKG before. I think these sound pretty nice overall. Apparently the pads are different (confirmed) and the drivers are cherry-picked and closely matched (AKG's claim). I have heard that this edition is bassier, warmer, smoother, etc. from folks on Head-Fi.
The bass does not sound as rolled off to me as the K701 graphs suggest, so the bass claims might be true. They sound more in line with how I remember the HD598 sounding in that regard. I think they could still use a touch more lower bass. The treble also sounds pretty smooth and not exaggerated, which I like. I was afraid they might be too bright or lacking in bass for my tastes, but so far I've been pleased.
I fairly certain that ~2KHz bump is there, just like in the K701 graphs. My ears find it to be pretty nasty, though I primarily listen to heavier music that can be easily harsh on the ears (ex: Opeth at loud volumes). EQ helps a bit, and I've also tried experimenting with different damping materials in front of the drivers to see if I can tame it. I've made it a bit better to my ears already, though it's hard to target that exact area without affecting other stuff.
Still not sure I'm going to keep them in the long run, but I am liking them so far aside from that 2KHz bump. I got them for close to $300, and they might be appropriately priced around there at most. Can't say I'd recommend them at their $500 MSRP.
Apologies for bumping an older thread, but I wasn't sure this warranted a new thread.