Two years ago I finally jumped off the Thinkpad wagon to buy a Sony Z12. I have my loyalties and preferences, but at the end of the day I know that the one feature that actually directly impacts my productivity is screen resolution. The higher the resolution, the more stuff that can fit on the screen at once. The more I can fit on the screen, the less swapping between windows I have to do, and thus the less I have to interrupt my workflow. At the same time, I travel a lot, so I need a small computer. My criteria will always be the smallest usable computer with the highest resolution.
For a long time, the Sony was that computer. New computers came out over the past two years, but none of them stacked up well against the Sony. Even the Z12's successor, the Z21, wasn't much to write home about.
Then one day I read an announcement saying that Asus was releasing two new ultrabooks (you know, the Windows laptops that look like Macbook Airs), an 11.6" and a 13", and both would have full 1920x1080 screens. They'd be about half the thickness of my existing laptop, and the smaller of the two would be half a pound lighter. I was sold.