The Logitech C920 is a design from 9 years ago, with a sensor to match. You're missing out on a lot of sensor improvements over the years that give things like better low light performance - handy when using a camera for video indoors. It's also, unfortunately, close to the best webcam out there. Apple really don't seem to have brought the camera improvements from their iPhone range to their MacBooks, apparently their built-in webcams are as bad as everyone else's.