Well, there's always absolute ranking you seem to see here , like hd800 > srh940.
As a guy who didn't test much headphone , and cannot test them on store, I usually rely on consensus / ratings.
But I realized that a headphone excellent for a majority, doesn't necessarily mean excellent for me: there's some hyping, fotm, etc...
Also a perfectly "neutral" headphone is not necessarily what I enjoy the most.
I like some "euphony", perhaps what other call "good timbre" .