I often use sandpaper on leather (on wood) backing to touch up my knives, so they generally wind up with a convex edge, regardless how they started. This seems to work especially well on edges that have started out with pretty acute V-bevels on them. There's usually a little trade-off in that. An acute V-bevel is probably the best hair-whittling edge, but a gentle convex works so well at almost all other cutting tasks (cardboard, leather, plastic, slicing food, etc.). And the main reason I like the convex edge, it's very, very easy to maintain with stropping technique, either on a bare/compounded strop, or with some wet/dry sandpaper on the strop block, if the edge needs a little more work.