PP: So it turns out we have knife sharpening thing, so I figured I would sharpen my Dad's old army reserves diving knife, my Swiss Army Knife, my PoS KA-BAR Clone Knife, and my Pantographic Knife. As I was sharpening the diving knife I thought that it didn't look anymore sharp than when I had picked it up, so I gently ran my thumb along the blade. Oh yeah, it was sharp alright. I have the bandage to prove it. XD
Brush the blade along your thumbnail, if it pulls up a layer, it's sharp enough.