It's Lenovo's most beloved business laptop: the X1 Carbon. The fourth-generation model has been released, and it's as beautiful as ever, bringing the best aspects of the X1 Carbon line and refining them with updated hardware, a lighter weight, and a thinner body. Lenovo boasts the laptop as being “Ultrathin, Ultralight, Ultratough.” With a price that can top a couple grand, it’s also pretty expensive. Is the latest Lenovo X1 Carbon worth the upgrade? Read our full review to find out!