So I've been using the X1Y2-OLED and the 2017 14" LG-Gram-FHD for a while, and decided to return the Yoga for a few reasons.
Build quality to begin with is very disappointing. I've used business laptops from over six different brands, and frankly the X1Y2 feels as cheaply constructed as another consumer ultrabook, especially next to the Gram.
I can drop the LG Gram from waist height onto a cement floor. Of course not intentionally, but after watching reviews boasting its durability, I performed the test myself several times and to little surprise, found no visible damage. With the Yoga however, I feel equally wary of its build as I did with my 2016 Spectre x360. I've handled laptops long enough and my instinct tells me this wasn't designed to survive a hard knock against a wall, much less a hard drop.
Second reason is battery life. With the 25 watt TDP, OLED WQHD display and multiple PCIe links, I already anticipated this going in. But now that it's in front me, next to the Gram that lasts 8 hours (on average load), 3 hours feels immensely inadequate, especially since I use the battery between 15~85%. And 3 hours at best it is, with all the most extreme battery saving tricks I could think of. Usually I don't complain over empty manufacturer promises, but this trivia was hard to ignore.
It's pretty obvious, but the Gram is also 400 grams lighter than the X1Y2, which really does feel unreal (and ironic), as it was easier to use while standing than the 2 in 1.
Btw, hope the NBC reviews the LG Grams.