It's my understanding that all the Wusthof blades are now being manufactured with the Petec edge. I just got a new Wusthof Classic cook's knife and a paring knife. How can I tell if it has the petec edge? I just bought it, but who knows how long it's been on the shelf. I want to make sure what the angle is so I can sharpen it properly. Also, if it's not the Petec, is it possible to turn it into one?