Memory & Storage
Another boost to performance comes with Apple's decision to increase the available RAM on the new MacBook Pro (a much-requested move by professional users). The 15-inch MacBook Pro is now configurable with up to 32 GB of RAM, with 16 GB as the base-level option. The 13-inch MacBook Pro can come with 8 GB or 16 GB of RAM. The ThinkPad X1 Carbon doesn't offer a 32 GB RAM option, with the choices between 8 GB and 16 GB configurations.
On storage, the X1 Carbon is available with 256 GB, 512 GB or 1 TB. The 13-inch MacBook Pro, meanwhile, offers choices between 256 GB, 512 GB, 1 TB and 2 TB. The 15-inch model has all of those options, as well as a massive 4 TB option at the top level.