When fans of professional Overwatch players watch streams, the question of "what sensitivity do you play on?" Always, and I mean Always, gets asked. Streamers may post all their settings and what equipment they play on all over their website and Twitch channel, and I guarantee that they still get asked this question on a daily basis.
Ryujehong, arguably the world's best Ana player, wouldn't be able to give a clear answer after jokingly playing with extremely low DPI settings.
For the fanatics obsessed with Ryujehong's sens settings, hoping to get an edge on the competition by copying their favorite streamer, beware, Ryu is still kind of a beast; Even with "gold-tier accuracy" when on low sensitivity. So, don't expect changing your sensitivity to carry you into top 500.