For the most part, Lenovo's Thinkpads have a BIOS setting that allows you to switch the Fn and Ctrl keys. This has been around for a while now and is still an option on newer Thinkpads (although, I can't confirm that this option exists in the X1).
You can also use xmodmap, but that's not going to work outside X11 (if you tend to do much work without X)
I have both a Dell and a Thinkpad, and it's definitely much more convenient to have Ctl readily accessible with the left pinky than Fn, which you get on the Thinkpad.
The Ctrl key is so often used by developers, especially when one uses Emacs shortcuts (not only in Emacs itself, but also in Readline-enabled shells or other software), that you can easily get RSI. Remaping Caps-Lock as a Ctrl is a necessity and once you use it you'll never want to go back to the default left Ctrl.
Then I got Dell (E6400) and liked the keyboard even more. The feel was better. Only thing I missed was the light from Thinkpad. While the keyboard was backlit, I found the top light to be more convenient.
What I meant is that it's easier to access on a Lenovo keyboard than on a non-Lenovo keyboard, since it's closer. I have a hard time hitting Left Ctrl on the Dell keyboard than on my Lenovo keyboards.