Again although this guide is not specific to Overwatch, it offers an extremely thorough overview of mice and mouse technology. There are lots of charts, tables, and math!
This guide is not specific to Overwatch. Instead, it covers a myriad of topics specific to your mouse. If you want to learn something about mice, chances are quite good it is contained somewhere within this guide.
Although it is not generally suggested you should exactly mirror any professional player's settings... looking at what is typically used might help you when checking out new hardware, or trying to adjust your settings.
Join for Overwatch Resource Updates
Want to hear about new resources? Suggest changes or updates? Berate me for writing or adding garbage? Come hang out in my Discord. It consists of a channel where I only post updates for this resource thing. It may eventually contain further channels. I don't really know how to work this thing oh god help I need an adult. "This thing" being social interaction, not Discord.