The q701's have everything people like about the ad700's, but they are just better in every way.
Better ability to pick out minute details in audio. My q701's have more bass than the ad700's and the mid bass is something to behold when using a headphone ampn. Soundstage on the q701's is slightly smaller than that of the ad700's, but I feel it is more accurate.
The AD700's can really exaggerate to your ears where a noise is coming from. Sometime's too much, so in games where audio really gives off direction through wall, they are really easy to use to prefire people.
You can do the same with the q701's, but in games where the noise isn't really exaggerated through walls I feel they are better at pinpointing player positions. I can tell up and down better on the q701's than the AD700's also.
I find the q701's to be more comfortable too because the insides of the cans do not compress my ears like the ad700's do.