I don't own SE-MASTER1 (had an opportunity to listen them for a couple of weeks), so I'll quote some lines from my mini-review in a metal cans thread (more - in a head post of http://www.head-fi.org/t/715478/headphones-for-metal-music-ultimate-solution)
Sound signature of headphones is deliberately neutral. But, not quite absolutely completely neutral ) Highs are no problem - detail worthy TOTL title in the absence of brightness which can strain on Senns 800 or say AKG 812. Mids perhaps could be neutral and natural, but taste of mids... I do not like such cold and "gray" mids (can't find another words). The same 800 I think neutrally and are neutral-neutral in my view proceeds in the light color. LF particular, with the rise of fashion, but not linear, an impression that is raised mostly lower bass (without continuing to bully sub-bass). Rather like effectively, quickly and without busting by volume. The scene is spacious in size, decent stamp (but not the stadium like the course 800).
But first, one more feature. Compared to 800 (and not only to them), there is something "material" in a sound, a sort of "dark matter". No veil, such kind of substance, that is not obstructing the lens, not masking details, but anyway clearly presents, giving the "weight" of the sound. Is this good or bad? Hard to say. I'm more at side of ease and transparency of the heart 800. But that's what can generate interest om classical music.
Total. Headphones I did not like. And the problem is - I did not found a "spark" for me. A technical performance is very, very good, true TOTL headphones.
So, comparing Odins vs SE-MASTER1 I would be far from objectictive )) I really like sound signature of Odins. And don't find MASTER1 interesting for me at all. I could (and let me know if I should) carry on with comparison, but wheter It will be useful - I have doubts.