The highest video resolution of the AN-VC500 is 1920 x 1080 pixels. That's over six times the video resolution of the most common maximum video resolution of 640 x 480 pixels.
This webcam's video resolution (1920 x 1080 pixels) is in fact the best video resolution across all webcams that have been on the market for a comparable time to the AN-VC500.
The worst video resolution amongst similar types of webcam is 640 x 480 pixels.
It may also be worth considering one of the alternative webcams that have a video resolution of 1920 x 1080 pixels currently available including the Brother NW-1000 (£94.52) which is cheaper.