I was offered a CHEF'S CHOICE 15XV a few years ago and this is what I use to sharpen the knives at home (very ordinary knives).

I never knew if this was the summum of how sharp my knives could be, or where I bring them on a "sharpness" scale of 1 to 5 for a given knife.

I was also wondering if this depends on the knife - with some knives being better for such electrical sharpener and some worse.