I agree there's a lot more to sharpening hooks than meets the eye. I've seen all sorts of descriptions (three sides, just inside edges, 4-edge diamond...) Most folks seem to take a few swipes and declare it done. I've been doing three edges (two inside and one outside the bend) but it doesn't feel right. If someone has a sharpener's (as opposed to a fisherman's) description of what to do and what to use, I'd be glad to hear it. Methinks the place to ask is at knife or woodworking shows, and not fishing places.
I've been absolutely amazed to see what a new, laser-sharpened hook wil penetrate. Wish I could come even close when sharpening by hand.