Plasma does not have zero input lag. You may be referring to pixel response time, but a TV introduces input lag by having scalers and multiple inputs. Pixel response time is only part of what makes up input lag. But input lag is the last thing you should be worrying about as a console gamer. The controller you have in your hands is the biggest source of input lag. Low input lag is a shooter's paradise but not when you're controlling it with nubs and auto aim.