I have both the MH463 and the EFi-82 MT (despite my umpteen posts on the thing, I still am not sure where the space and hyphen go in the name. xD.)
I like it a good bit more than the MH463. It has more resolution, or so to speak.
But that's not a knock on the MH463 at all. It's still an incredible headphone, and it's the one that got everyone hipped to Somic.
I'm not an expert in Hong Kong audio sales, but the sheer number of headphone shops there is crazy! Hopefully, one of the has it!