Great review, K701 with FiiO E7 and E9 user here too. :)
Loving every bits of it and I've never felt this happy listening to songs and musics.
Call me a fanboy, whatever but this headphone turns me from a basshead to a clarityhead. (if this is the right term lol)
I've listen to all my favourite songs and I am very surprised by these little details that I have never been able to listened to, and they are absolutely fantastic and pleasant to listen to.
Basically for what I have paid (200 pounds), I'd definitely say this is the best money I've spent in my life :D