That's a tough question. It also depends on what you are driving the HD800 with vs what you are driving the L700 with. Underpowered, most cans end up sounding bright and closed. Let me give it a shot: my HD800 is driven by the Cavalli Liquid Gold. What I find is that the HD800 is wonderfully detailed, nuanced and has a wider soundstage, the L700 is probably more effortlessly musical and enjoyable, while not being that far behind in terms of details. There is also an effortless depth and density to the sound. I am not quite sure we are comparing apples with apples here. At least that's what I think. To back up my point that it is not really a like for like comparison, neither cans are going anywhere any time soon.