I know that detail isn't the end-all for a headphone, but most likely because of that there seems to be a dearth of information on the comparative levels of detail between some of the nicer headphones. For an example, the HE-400 and HE-500 have both been praised for detail in a mid-fi headphone, but I don't see people who have heard both reporting back the difference in detail. I've been searching for information comparing headphones such as those, as well as others like the DT880's, Q701's, HD600/650, SR325i's, and up to the more hifi options.
So, for those of you who have heard a few mid to hi-fi headphones, could you please report how the detail varies between them? Not the overall balance, not the soundstage, and in particular not the illusion of detail due to forward treble. But what headphones have stood out as being able to resolve details you couldn't hear as well with others?