I have spent quick a bit of time with the Q701 and it has a bit more bass in what I call the "upper bass" range of about 80Hz to 200Hz. Otherwise I found it to have the same sound signature as the K701. The boost in the upper bass, in my opinion, masks the output in the lower bass.
In my recording rig I own:
AKG K701
AKG K702 (no reason other than I needed another pair for when I am not working alone)
AKG K240DF (my personal favorite as I cut my teeth on these things)
AKG K240 Studio
AKG K271
Sennheiser HD580
Sennheiser HD650
Sennheiser HD414 (from the old days)
Grado SR80i
Sony MDR7506
In my recording rig I own:
AKG K701
AKG K702 (no reason other than I needed another pair for when I am not working alone)
AKG K240DF (my personal favorite as I cut my teeth on these things)
AKG K240 Studio
AKG K271
Sennheiser HD580
Sennheiser HD650
Sennheiser HD414 (from the old days)
Grado SR80i
Sony MDR7506