for me it is the Victorinox Swiss Army Knife. The inox steel is not hard. Blade geometry also makes it a mean slicer. Just a little touching up and stropping and it is razor sharp. If you want to feel good about a sharpening job, an SAK will make you feel like a master.
What do you find is a piece of cake to sharpen?
What do you find is a piece of cake to sharpen?