Thank you very much, your opinions are really helpful. A month ago I didn't know about nothing concerning Japanese knife, now I can choose between laser, medium weight, workhorse, convex grind, flat profile or belly, different steels etc.
Akifusa is the one if I choose stainless steel, but now I wonder "jumping" directly into carbon knives , I mean, clad carbon knives.
Looking around, I found that Richmond AS Laser could be a nice choice. The blade's grind remind me to Konosuke Ginsan. Thin grind with a more stiff spine, convex profile for non-sticking yet medium-light weight and wa-handle (I like wa handle). Not as flat as Akifusa but not too belly. I hope/believe that Richmond is stiffer than other Laser.
The inconvenient I see are that the very thin grind of Richmond could be more fragile or prone to break than Akifusa, and, of course, rust issue. I don't mind patina or discoloring but rust is quite a problem. If I am not wrong, white steel is more reactive than blue steel.
What about blue steel 1, 2 or AS ?
I read on zknives.com that Chromium is added for corrosion resistance, and blue steel 1, 2 or AS have the same percentage of it. So... it seems to be the same rust resistance for all types of blue steel.
I have not found a lot of review on this knife... do you think that for hard ingredient Akifusa and Richmond are about on the same level ? If Richmond is more flexible/fragile than Akifusa, then it's not the good choice for me.