No offence meant whatsoever, but most (if not all) of the reviews I've read here where the member thought the two were identical, came from people who weren't really fans of the K series in the first place. In other words, not avid listeners of the headphones in general.
The K702 is my favorite headphone, of some 20 or so $600 and under cans I've tried, including the HD650 and 600, some really high end AT cans, the DT880, D2000 Lawton Mod, etc. It's not like it "blows those others away," but the sound signature of the cans really suit my tastes and needs as to musical styles.
I have owned and compared both the K701 and K702 side by side, including swapping pads. (The swap made both sound worse). I assure you they are different. The K702 is simply everything the K701 is, but improved. They are more comfortable in that (at least with my pairs) they have a better head clamp, (looser), and far more comfortable pads. And soundwise, the bring the vocals forward to match the distance of the rest of the instruments (the K701s make the vocals sound too distant), and they improve the bass presentation, all-important on these cans as we all know. These were both very necessary and welcome improvements. At one point I had simply given up on the K701s, which led me to buy and try all these other great mid-end cans. Always disappointed, when I finally gave the K702s a try, I knew I had found my babies, and I sold everything else (including the K701, gladly).
They are obviously brother and sister. If you don't like one, you won't like the other either. But the differences are far more than slight or subtle. They are noticeable even to a casual listener. They are obviously different headphones.
I have no doubt whatsoever that the K712 is simply an even better improvement, most especially in the bass response. However, given their $450 price in the USA compared to the $225 price of the Q701, which I hear are even an improvement on the K702 bass response, I'm going with the Qs for now.
Edited by Kouzelna - 9/19/13 at 12:05am