I really like the x1 Carbon. Nice and light, touch screen is optional and Lenovo is pretty good with Linux support.
After going home and doing some research,[1] it became obvious that the screens were mis-calibrated out of the factory.
If you do go with the X1c, make sure you either get a color calibrator or find the color profile ahead of time.
[1]: http://www.notebookcheck.net/Review-Update-Lenovo-ThinkPad-X... (check the display section)
You can read about my experiences with the X1 Carbon here: https://news.ycombinator.com/item?id=4848375
I'm typing on that same laptop right now and loving it.