Thickness & Weight
Even though Apple has sought to improve the portability on the MacBook Pro, it's still noticeably heavier than the X1 Carbon at 3.02 pounds for the 13-inch model. Even with its larger display than the MacBook Pro, the X1 Carbon weighs just 2.5 pounds. The 15-inch MacBook Pro, meanwhile, weighs 4.02 pounds.
The MacBook Pro is a bit thinner than the X1 Carbon, though, both for the 13-inch model (0.59 of an inch thick) and the 15-inch model (0.61 of an inch). But it's close: the X1 Carbon measures 0.62 of an inch thick.