Hi.
I still own the original Odin mk2 (with even the first version of earpads called "V1" (with small holes) with its sublime lacquered Karelia birch wood (natural color).
You can see it here, on the right, on the picture I just took this morning (in France).
This headphones Odin mk2 are very heavy (compared to the Thekk and Thror) and goes very well with my tube amp Viva 2A3 (in the picture), just like the Thekk and Thror, by the way.
The sound of the Odin mk2 is close to that of the Odin Thridi (which I've been able to try) with maybe a bit more treble than the Thridi (and the Thekk), but it treble is much less fine, more grainy and irregular than the Thekk.
The Odin mk2 is magical for listening to electric guitar for Rock, with a very saturated, warm, very euphonic sound (especially with this tube amp); but the sound is even truer, sharper and more detailed, while remaining pleasant, full and complete, with the Thekk that I prefer in the end for listening to all kinds of music.
I also have the Thror headphones (made of bog oak for the cups), but it is currently with my eldest son for his piano compositions via the MuseCore piano composition software.
The Thror and the Thekk are very often listened to together (with my eldest son) on the two 6.35 mm jack headphone outputs of the Viva 2A3 amp for listening to and watching blu-ray movies in their original version (HD sound), and for nothing to hide from you, most recently the "Matrix" trilogy.
These two headphones, by their definition and aeration, not to mention their wearing comfort (so well adjusted for the Thror headband), are excellent for Home Cinema use, just like listening to my CDs of all kinds of music.
Currently, I hardly listen to my Odin mk2 anymore, which remains, however, by the beauty of its wooden cups and its finish, an art object!