My friend has just bought a pair of brand new Q701 in white color and I managed to borrow it for a few days for a test.
I took measurements using the exactly same settings and obtained the following plots for Q701 and K702:
The RED curve is for Q701 while the GREEN curve is for K702.
The curves have shown that the sonic signature of Q701 and K702 are almost the same, i.e. that both have very similar frequency response as well as controls over the mini speakers. It appears that Q701 and K702 are actually the same and AKG just marketed the same products using different brand names bearing in mind that Q701 costs a lot more than K702.
With these measurements I would expect the sound quality produced by both CANs should be the same. To confirm this I AB tested the two CANs with different CDs and SACDs.
After lengthy tests it proved that I am WRONG !!! Even though the Q701 is brand new and without any burning in the sound quality is actually better than my K702 which has been using for more than 9 months.
The following is my observation:
Low Freq. : Q701 is slightly tighter and extended than K702
Mid range: vocals from Q701 is more sweet and natural than K702
High frequency: High frequencies of Q701 is rolled off by a bit when compared with K702.
Though the overall sonic signature of both CANs is very similar, i.e. good musical clarity with excellent sound staging, my ears told me that Q701 is a bit more musical while K702 is more analytical which shows up all the details in the CD.
Don't ask me how come there is a difference between the two CANs if the measurements are very similar. I cannot give an explanation.
Whether you like Q701 or K702 depends very much on your preference in what you want to hear but to me the sound reproduced from Q701 suits me more. I believe this Q701 should perform even better after its burning in.