Not sure, tho some old post on CKTG forum said the OMS is by their master craftsman, so I guess the same difference between Muteki and Master Smith?
Anyway Hocho has them for pretty good price, I dont like Hocho but the prices are the lowest I've see, even cheaper then Sugimoto direct.
OMS direct cost around $600 without shipping
No. 6 At the Sugimoto Hamono online shop, we have set up categories for choosing your knife by type of knife, by type of ingredient, and by series, to make it easy for customers to find the product they want. If you cannot find the product you want, please do not hesitate to contact us.