I have just purchased and reviewed the Logitech C920, C925 and C930. Webcams are primarily used for VCs for business calls and have been used for both individual and group VC calls. Key points after using all three: C920: Lowest price, good video and sound quality, 78 degree viewing angle; sharp like C925. Much wider at 90 degrees - much wider at 90 degrees - for my use this was best for VC where we have 4 people at a table - a larger angle makes a huge difference. I would recommend the C930 for group video calls as 90 degrees makes a huge difference. To be honest, the picture between C930 and C925 is very similar, and the key point is the angle of coverage. With the C920, it's a price game - $20 less for lower video quality.
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