Funny thing you saying its a stupid question since all people asking on forom which Pro of Overwatc answer is that question.. there is already a pro that has program to calculate how much dpi versus ingame sens to get the number of inch or CM on your mouse pad to get a full 360degres. I think you should read a little more about what people are asking you before saying they ask stupid question lol. Maybe for games like CS or whatever else Korean player use crazy high sense, but its the complete opposite for a game like overwatch... ive watched every single tournament of that game and I can tell you I havent seen any1, even Korean player, use that crazy high sense that you are talking. Go watch it yourself on stream witch some of the best player on the pro scene are streaming, they all use pretty low sens and low dpi.
greets