I am happy to report there is an LG screen in my device, which has delta E below 2 on both greyscale and color accuracy, the contrast is equivalent (1250:1 but that's just because it is already calibrated to perfection, which takes away from of the peak brightness).
LGD051E is the panel ID.
Also in my unit the fan is perfectly quiet, I heard they corrected the issue with software update. Sound is also very good. The only thing not so good for me is the sharp edges, which cut your wrists while gaming for a long time. It is not disturbing for web browsing but for extended sessions it can get uncomfortable. Otherwise it is a wonderful device.
For my needs I feel I need a larger display and keyboard though, as this is not comfortable for gaming. I m going to try the Dell XPS 15 2017 next.
The HP spectre 15 couldn't match the Yoga in sound or display quality (through contrast in my unit was better than in the Notebookcheck test, on par with the Yoga) but the color accuracy was poor and could not be fixed (similar to how it was rated for the yoga here) despite having the same panel ID.
The HP spectre is a great device but the display was not to my liking.
My Samsung Ativ Book 8 has been so amazing for me, I loved the matte display, the amazing sound and the comfortably large keyboard. Now that Samsung stopped producing laptops it is so hard to find a good replacement for a great multimedia laptop!