Relevant to this, there's a guy out there who makes fixed blade knives from new DeWalt "Search and Rescue" reciprocal saw blades. Very tough stuff---made to saw through concrete, conduit, cables, buildings, trains, etc. I think his main biz is forging survival spear heads and things like that.
He makes the edge extremely sharp but the knife is pretty basic in three different grades: Plain, with the yellow and black paint and "Dewalt" logo still on them; grade 1, with all paint stripped to bare metal and blued; and grade 2, paint stripped, coated blade with a wingwalker sand textured handle dip. As I recall all have the new saw teeth remaining along what forms the spine.
Very novel and seem like they'd be pretty cool. If I can find my bookmark for the guy in the next few days I'll come back and post it. I've wanted to get one for a couple years now but haven't. You might be able to find him w/ a Google search..... really worth at least checking out.