I'm a fan or Mercers as well even though there are many that don't care for them. With the stamped version you have, I think they are on par with Victorinox fibrox knives, and feel better with their ergonomic santoprene handles. Their forged line can hang with forged Wustoffs and Henckels as well. I have a Mercer Chinese Chefs knife with santoprene which is very thin and an excellent slicer. They do require constant steeling and run softer (Rc56) as western chef knives usually do compared with their Japanese counterparts . But, for what they lack in hardness compared to , they pickup in toughness. I've broken down many chickens with my Mercer, even going thru small bones with no ege chipping and only edge rolling. Just can't go thru bigger bones though.
Mercer uses X50CrMoV15 currently, but I've seen em in X30CrMoV15 as well. A very old steel used mostly in Euro chef knives like Wustoffs, Heckels, Victorinox, etc.