I've owned the d5k (twice). For me, it's not even very close. The AD wins across the board. The d5k has a spikey treble, slightly recessed. While the bass impact is more visceral, it's loose and untextured compared to the AD. The d7k is better in the mids and tighter on the bass, but still does not match the AD.
Thanks again Matt... Looks like Dan hit a home run on this one. I love my MD 3.2 and most of the time they are my "go to" cans. I will be ordering the AD in addition to the MD as soon as they become available.