Well, I've got both the K702 and the HD560s - I've been a bit nutty about them and I have 3 units of HD560s and 4 units of K702 now (after buying another one today at £79)!
Mainly I bought another K702 because Sean Olive posted a measurement for a K702 that he bought recently and it totally tracked the Harman Curve, so I wanted to see if the new ones being produced now have been changed in frequency response (I have a miniDSP EARs that I can measure them on, and because Oratory has measured one of my units of K702 that I sent him then that means I can do a valid & accurate conversion curve just for that one model of headphone - conversion curve from miniDSP EARs to GRAS). Here's the Sean Olive measurement of K702 that he bought recently:
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You can see that looks nothing like the K702 measurements that we know! So I definitely wanted to buy a new K702 and then measure it to find out if it's the same or not. I also thought that even if it measures similarly to my other K702 units then it would be interesting to see the unit to unit variation after having measured 4 seperate units of them.
About your question though, "what stands out for you about these headphones"? I think the soundstage is fun, it's wide, I also think they do really well with female vocals - note I'm talking about after EQ to the Harman Curve. I think the bass on them after EQ is adequate/good, and they're very comfortable to wear. To be fair, I think I've got enough units of HD560s and K702 to last me through the zombie apocalypse, or if they just stop making them eventually, lol - which is more likely!?
I agree that HD560s is a more sensible headphone to choose for a purchaser, as they don't have the solder reliability problems of the K702 and the HD560s has better unit to unit variation and better channel matching. I also agree with you that the HD560s does a few things better than the K702, the bass is noticeably more defined in the HD560s - talking after both have been EQ'd to Harman Curve of course. I also agree with you on your perception that the soundstage of the K702 is wider than that of the HD560s. In the past I've noted that the imaging is a bit better on the HD560s, ie the imaging within the soundstage is more precise than that of the K702 - normally assessed for me by listening to smoothness of panning effects as they move around and also through fps gaming (locational sound through Virtual 7.1 Surround Sound in fps gaming). I personally think the K702 is definitely worth £80 if you're using EQ - and if you're not afraid of using a soldering iron on the wires when they will likely fail after 1 or 2 yrs (sometimes sooner). The K702 frequency response though is very easy to EQ to the Harman Curve, so you don't have to be that concerned by the unconventional stock frequency response, the reason it's easy to EQ is that it's very smooth in it's undulations, so you don't have to use narrow filters on them (pic from Oratory's EQ):
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