Ernie - "I am an expert in the use of the long sword.  I know exactly where to strike to disable my opponent the fastest & most efficiently" 
Bert - "Hah.  I'm just as good as you are with my magic sword Slicer.  It's so sharp that it's as good as you ever are."
Ernie - "Well, if I was using slicer my superior skill combined with its incredible sharpness would be nearly unbeatable."
Bert - "Nope.  That would be too much.  So, this magically sharp sword is no better than your simple magic sword Ouch when in your hands."