This. Just moved back from my 2014 rMBP Pro to a 2012 Thinkpad X220 for the trackpoint and keyboard. Shame about the display but eh there are external FHD displays when you really needs to. Retina screen and trackpoint is going to be amazing when I upgrade to a X1 sometimes I guess haha.
Do you have an IPS display for your X220? It doesn't increase the resolution, but it does make it much better. (The X220 is pretty easy to swap the screen on too.)
No I don't, but I am looking to swap the TN display with a FHD IPS screen, as mentioned in [0], but sadly there are very few aftermarket kits around these days last I've checked.
I have a couple of the FHD mods from here ( https://forum.thinkpads.com/viewtopic.php?t=122640 ), but they took quite a while to get to me, and by then my enthusiasm for experimental soldering had waned, but sometime I will try.
But even just swapping in an 1366x768 IPS panel for the TN panel of the same resolution makes a great difference. And those you can find fairly cheaply.