Hi Berto...
The question that you're asking is very interesting. I can't reply to that but I saw that you have the idea of Jap Knives made exclusively with non stainless steel (high carbon steel) but they work now some modern alloys that are 100% stainless and others semi/inox and they have the same capacity of taking an scary edge and the edge retention is just as awesome as with the high carbon steel.
Take a look, this is my favourite knife, you get the frightening edge of a high carbon blade, is ultra light, has great fit and finish, is made with traditional methods by a family dedicated to the trade since many generations ago... And you don't have to break the bank to get one, I'm talking about the Konosuke HD wa gyuto http://www.chefknivestogo.com/kohd27wa.html it gets slightly stained but doesn't look "rusty" and it doesn't impart any kind of smell or flavor to the food, this same brand has the HH series wich is SS. Or give a try to the Gesshins http://www.japaneseknifeimports.com/kitchen-knives-by-type/gyuto/gesshin-ginga-240mm-stainless-wa-gyuto.html
Both are top notch and perform like knives that cost several times that price tag.
Or if you're more into western style but want Japanese performance get a Mac knife, very affordable and has the best of both worlds. Looks a bit like a German knife and performs like a Jap.
P.S. BTW, both vendors that I recomended are true gentlemen and are extremely commited with their products and with the customers.
Best regards from México.
Luis