There is actually a good webcam now. It's AverMedia PW513. It has a Sony Exmor 4K sensor, and generally favorable reviews.
In this review, there are issues with the colours and the auto exposure.
https://youtu.be/wO-H3tChhQ4?t=210
Also it is unknown how well it works on Linux.
Wow, it sure does look like quality webcam, the only thing someone might miss is custom lens with fancy bokeh.
Edit: Watched to the end, it does fake 1080@60 by upscaling 720 :( So still a good choice if 1 you dont need 60Hz 2 dont mind being scammed by a Taiwanese company.
https://www.razer.com/streaming-cameras/razer-kiyo/RZ19-0232...
lens the size of needle tip and example images looking like ass