Fwiw, I watched the Fellowship of the Rings Extended BD (PS3 to Denon receiver through HDMI) the other night and it was awesome. Extremely clear, great soundstage, good low end (but would still prefer a little more for my tastes). Definitely a step above my HD650 in the same configuration.
I've also been listening through my iBasso D4 from an iPad (as a USB DAC through the camera connection kit). The sibilance has decreased and is no problem unless its in the material. The low end is tighter and can kick if I adjust the eq a little. This makes for a VERY nice portable rig. When playing from the music app, I have the eq set on "acoustic." when playing from the equilizer app, I add +6db at 60Hz (Q=.5), +3db at 3KHz for more vocal presence and -3db at 8KHz to tame sibilance (but have brought it back to 0 on several albums in the last couple of days). I feel like they're starting to settle in and the high end is calming down a bit.
Still haven't listened through my LDIII but will soon. I did a short direct compare to my HD650 and it just reaffirmed that the 700 are better in just about every way for me. It's certainly not as laid back, so I see people still picking up the 650 for relaxed listening, but the 700 is a huge step up in resolution and treble. The low end may need a little added eq, but is much tighter and precise with noticeable bass extension. My iPhone/iPad sound very good but I get another step up with the D4. I'm hoping that the little dot will be another step up again (which, of course, will push me into the next amp upgrade).
Regardless of tests, charts, and graphs and measurements, the HD700 are simply excellent headphones that seem to work very well from devices that others (650, 800) won't.
