a (damn) sight better
Quite a lot better (than a different person, thing, or condition). "Damn" is used to emphasize how much better someone or something is. The car should run a damn sight better now that you have the tires aligned properly. So far our new intern has been a sight better than our last one.
a (damn) sight worse
Quite a lot worse (than a different person, thing, or condition). "Damn" is used to emphasize how much worse someone or something is. Your car is going to run a damn sight worse if your tires remained improperly aligned. So far our new intern has been a sight worse than our last one.