Steam has published its hardware and software survey for January 2020. While the video card usage chart shows a better month overall for AMD after the bleak showing in December, there seems to be an interesting tussle starting between two new entries in the form of Nvidia's GeForce GTX 1660 SUPER and AMD's Radeon RX 5700.
https://www.notebookcheck.net/Nvidia-GeForce-GTX-1660-SUPER-pips-AMD-Radeon-RX-5700-for-take-up-in-Steam-s-hardware-survey.453970.0.html