A friend gave me the his x1 carbon gen1 some time ago. The x1 carbon is little bit different from other Thinkpad because it's a combination of a Thinkpad and a Ultrabook.

• It has a Trackpoint (and even Trackpoint buttons).
• It has soldered memory (only Elpida memory is support atm).
• It has Full-HD. (missed that on x2xx).

Looking under the hood. The x1 carbon gen1 look very likely as x230.