The two laptops look pretty similar — that is, until you put them side by side. They share the same sleek black carbon-fiber aesthetic and sturdy build quality, but the Yoga is noticeably larger. It’s also significantly heavier, weighing in at 3.1 pounds compared to the X1 Carbon’s 2.5 pounds. The Yoga is more of a throwback to ultraportables from a few years ago whereas the X1 Carbon looks and feels more modern.

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https://www.engadget.com/2018/03/16/lenovo-thinkpad-x1-yoga-review-2018/