That's a great question. Mark will need chime in on the other Addict knives, but the 240 SLD Addict: http://www.chefknivestogo.com/koadhd24wa.html
is most definitely NOT the same blade as the Artifex. It's make by Konosuke and has really great grinds for such a thin knife. It was super nice! Too bad they're OOS. I hope Mark has them make more of these.