I have the latest version of both on hand. Working on my review still. It will be pretty thorough and might take a couple weeks to post on here (early details can be found elsewhere in a less organized and compiled fashion, PM me if interested). I keep hitting random delays.
Let me try to sum it up, though. Both have a similar bass boost below 100Hz. Aside from that, AD is a bit more neutral with a wider soundstage but has a sort of hard glare and artificial sound to it. Usually this can be tweaked with the dots and felt discs, but it either doesn't go away completely or the tweaks take it too far. Probably not a problem for most listeners. The ZxF is a touch darker, not by much, but has more of an organic, natural, lush sound to it. ZxF has arguably better tonality in my mind. I found the latter to be more enjoyable and better "connected" me with the music, but it's hard to go wrong with either and comes down to personal tastes. (ZxF is pretty hard to put down once you get into them, IMO...perhaps not neutral, but a really good, enjoyable listening experience.)
Edited by hans030390 - 9/5/14 at 8:18pm