Guido and Gordo,
I too love my water stones. I start with 800, then 1200, and finish with 5000. At a woodworking trade show I ran into a guy hawking ceramic hones. It didn't make my pocket knife any sharper than it was. To the large irritation of the salesman. Sure got the attention of the other bystanders who wanted to know what I was using.
I was initially skeptical about how fast water stones cut until a friend insisted I bring a tool I frequently sharpened and try his stones. Showed up with a favorite chisel, and couldn't believe how fast the water stones cut. 5000 leaves an edge that I could shave with, if I shaved.
I think I still have a collection of oil stones here somewhere... no idea why. We caution visitors in our kitchen that our knives are sharper than they are accustomed to. Easy to keep them that way with water stones.
Guido, I don't know knives but laminated steel Japanese chisels and plane irons take a far better edge than European tools. This is the process of blacksmith-laminating a hard steel to softer steel. The cutting edge is amazing, supported by the softer steel. Not inexpensive, mine never leave my shop and are stored in a safe. A real pleasure to use. The blacksmith is given credit, mine were made by a relatively new guy- less expensive than the established masters.