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I would wait for more data points
I don´t know if it´s possible for a wooden can to isolate that well apart from there is no real clamping force on the DX 1000 and the leather while big is not quite as soft as the ED 8s. Most of the wooden cans I have tried is ported like denons and audio technicas though. The DX 1000 isolate slightly better then that.
My D7000s (now sold) eventhough were classified as "closed" headphones, in terms of isolation/leakage basically behaved like open headphones. The Ed. 8s are the best closed headphones for isolation and leakage that I've come across.