Sanjuro, the SG2 steel is a super premium japanese powder metalurgy blade steel, stainless not carbon steel. It is in the catagory of SPGS, Cowery Y, ZDP189, and the other best of the best.
It has been used successfully in the Shun line, plus, in the SG2 Blur ( one of the best knives for the money ever made by any company)
Expect great wear resistance, excellent edge stability, and expect it to sharpen pretty easily considering how wear resistant it is. Some very clever metallurgists spent some time on this one.
As with any ( especially hard, high RC) knives don't pry, laterally strain the edge while cutting, or use as a screwdriver. Think twice before cutting metal wire. Some do, I don't. I always try to use the correct tool for the job.
Keep in mind what Kai/Kershaw is really putting out here. Don't pass it up!
Thomas, Another knife torturing me, calling to me. Medicine or knife! BAH! I need the knife more don't I? Joe L.