Video quality for the demo video on showmewebcam github page is quite bad. I suspect it is mainly caused by the lens. Are there any good lenses out there that

Video quality for the demo video on showmewebcam github page is quite bad. I suspect it is mainly caused by the lens. Are there any good lenses out there that don't cost a lot? I could not find any good demo videos from the Rpi HQ camera. There are either macro shots showing the background blur, or some terrible medium range ones. If a good lens costs an arm and a leg, it is probably still cheaper to buy used entry level mirrorless camera, and it will also have autofocus. I really wish there were better webcams and I would not have to result some bulky mirrorless/dslr or iphone with droidcam.