I'm sort of shocked that with all your testing, you didn't seem to devote any time at all to discussing the sharpness and fit of the Yoga's OLED screen with plain text. For the record, it's mostly great, but it does have color fringing problems. I know. I have two of them. Tomorrow we're replacing the panel, but I am 90% confident it won't fix the issue. Perhaps an updated video driver could, but its almost as if its a design flaw.
Still having said that, and noting that I did have a Surface 4 at one point, the OLED X1 Yoga is bar far the BEST DAMN LAPTOP I've ever owned!! The colors and black level are amazing, the video is sharp, the sturdiness (kills the Surface 4) is impressive. I use it as a tablet, as a Tent, and most often, as a laptop. Do splurge for 20FR with i7-6600/512SSD/16GB - it's well worth it!!