Just wanted to say that I was pretty disappointed with the C920 as well. The difference to my work MacBook’s webcam is quite literally night and day. With the C920, anything but bright, frontal, uniform illumination gives you a bad to mediocre image, while with the MacBook I could pretty much sit in complete darkness and nobody would notice a difference.
I think if you want something for streaming you’ll have to use an actual camera that can stream to your PC instead of a “webcam”. Not sure which brands are compatible with Linux though. Many streamers do list their streaming equipment in their bio, so you might just want to look around for someone like that with a good looking stream or just ask.
Recommendation for a high-quality webcam for Linux
I have a Logitech C920 and am looking to upgrade. Something suitable for streaming....