We've been here before Mac and you know my stance on the matter . To me the extra "resolution" and "detail" of the 009 is not an improvement, I just find it to be brighter and less warm in the mid-bass region. To my ears the 009 is tuned more to the modern reference ideal, a sort of HD 800-ish signature which goes -1 on the warmth chart and +1 on the treble chart in order to wow you with greater "detail" and "air". Mind you, I do still enjoy the 009 with especially well-recorded music (far more than the mentioned HD 800) but the 007 connects me to the music in a way no other headphone has ever done. We obviously have different preferences and while the majority seems to prefer the 009 I also know there are those around here who agree with me.
A friend of mine is preparing a no-holds-barred KGSSHV that will hopefully be complete by the end of the summer. I will run both the 007 and the 009 out of it and see whether or not the game stats have changed.
The SR-007s are warm, no doubt...that is a colouration. Yes, the SR-009s are brighter, but not bright per say (especially depending on your amp/DAC/source; not just the amp!...which many forget to include). I'd suggest you review both FR response graphs on innerfidelity.com...might help sort things out for you a bit. If the warmer colouration (with less detail and air) of the SR-007 gets you going, then great. But as stated, my position owning both with 2 amps that drive them very well and a DAC that I am exceedingly happy with (and I've heard the SR-007 Mk1 from a DIY T2/PWD2 rig), there is no doubt in my mind which are the superior headphone. As I mentioned, I love the SR-007s and put them in my top 5 headphones of all time...just not #1.
Edited by MacedonianHero - 3/23/15 at 7:23am