I'm also a Hifiman's fan. Looks like He560 has all the strength of He6; speed, imaging, tactility.
In my opinion one of the He6's weakness is it's prone to have sibilance at singer's voice (PS1000 and HD800 also have sibilance problem but LCD3 and LCD-X don't.)
Could you please comment to this aspect of He560?
I am sure that's also down to your setup.
In my case at least there was never much sibilance.
Too much treble sometimes? Sure, but not sibilant.
Back on topic, the 560 has not as much treble energy as the 6 has, or so it seems from the impressions.
It is more extended and brighter than Audeze treble but less than HD800/Grado.
Edited by conquerator2 - 3/28/14 at 5:32am