Steam 2017 results showed that most people still game at or around 1080p.
1440p/2K is picking up steam but I believe it was no more then 5-8%, and 4K was below 2-3%.
Steam's June/July Survey 2017 results are in, google them and take a peak, the data they have is pretty awesome.
As far as CPU gaming comparisons I don't see AMD catching Intel with this generation. With higher resolutions the GPU takes over more so the results might get closer but lower resolution tests give you the real story on what CPU's are holding their own better. Intel's threading and architecture has been more commonly supported by most gaming platforms and engines, this is not something an overnight update will fix. Also, some games that are based on calculation and frequency dependent games will just run better on a CPU that can hit 5.0GHz, sometimes it does come down to raw clock speed. Not saying Intel is better or worse, but that's basically how it played out in the last 10+ years. That will now start to change.