I find them very, very similar; I don't know whether it's because they are both dynamic or what, but I was just A/B comparing them the other night, and while there were some subtle differences between them in timbre, etc, to me they have a very similar feeling and I could not make a decision as to which I prefer. I don't even know why I'm keeping them both, but I like them both so much I can't part with either! And those ZMF's are some seriously beautiful looking cans.... On the other hand, I found them both very, very different from the planars I've had like HE-1000 V2, Diana V2, and Emypyrean, all of which I'm selling.... They are all great headphones, absolutely, but it's down to personal preference...