I have a ThinkPad X1 Carbon gen4 running Fedora and am very happy with it. I switched from years of using MacBook Airs as my primary laptop. Wrote a first impressions post on the thinkpad subreddit here: https://www.reddit.com/r/thinkpad/comments/491tmf/x1_carbon_...
Thanks for the info. The Carbon looks really good, so it's good to know someone's already successfully put Linux on it without issues. Two questions: have you tried hooking up two monitors to it and if you connect an external monitor to the laptop and then close the lid do things work as expected?