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Been trying out a few borrowed phones over the last few days alongside my Sony SA5000, inlcuding a K702. My impression is that the K702 has the same sound sig generally but the Sony has better detail, clarity, air and speed across the spectrum. Given they are the same price and the K70x seem to be the most popular phones here (more have the 701/2 than HD-650s), I'm just wondering whether the Sony's are just not well known anymore or whether there is something in the AKG that appeals to people?
I currently own both and I agree that the Sony has better detail, clarity, air, and speed. However, the K702 has much better bass extension. The SA5000 has a 100hz bump that gives the perception of deeper bass, but it drops off pretty sharply after that. The bass light presentation aids in producing all the positive attributes you mentioned, but also makes the Sonys seem a bit colder and much brighter (too bright for some). The K702 is often criticized for its weak bass, especially for bass drive genres; the SA5000 would suit those genres even less. The SA5000 is also a fair bit more expensive than the K701/2, especially in some regions. The cable on the SA5000 is also terribly microphonic, something I'll probably have to resort to a recable to fix.
That said, the SA5000 is much easier to drive, only taking about half the movement on my HDP's volume pot to reach equal decibels. If I had to settle for one can as an all-rounder, it definitely wouldn't be the SA5000, but the K702 would still remain a front-runner.