I'm confused about the difference between a strip steak and a sirloin steak. I associate sirloin with the top sirloin I see at the grocery store that is thin and wide. But lots of steakhouses (especially New York ones) serve sirloins that look a lot like strips. Capital Grille says that it serves a sirloin and then classifies that sirloin as a NY strip. So is a sirloin steak a strip and a top sirloin some completely unrelated cut?