We're talking about movie actors which means that really matters is how they look, not how much they weighed. Cavill's physique is clearly more representative of comic book Superman's due to his proportions and how much he has filled out his frame with lean mass. While Reeve in Superman III was huge, he did it at the cost of putting on a good bit of bodyfat as he himself admitted. Shirtless, Superman III Reeve would probably have not have looked so super. No one is disparaging Reeve's commitment to the role or his accomplishments, but the physical expectations for actor playing superheroes have increased greatly since his day, in part helped by advances in training, nutrition and other sciences

. However, in terms of muscularity, muscle shape, proportions, and definition, Cavill is for the most part objectively superior.