I started using X1 Carbon 6th recently and it's an amazing little machine. Extremely portable (a 14" that weighs 2.5 lbs and fits in a 13" sleeve), great keyboard, great Linux support, good display, and it runs very cool (the fan is never on, despite running multiple virtualbox instances in addition to regular work that causes sporadic CPU spikes - e.g. compiling).

It's also very pleasant to touch and hold in your hands, especially if you like the Thinkpad aesthetics.