We made some statistics using blizzard’s api about heroes usage and winrates in Overwatch competitive play of Season 2. The special thing is that we used data only from top 500 players, so on this page you can observe most skilled players’ preferences.
The first graph shows a top mained hero. A lot of players indeed prefer playing one peculiar hero much more often than others.
The second graph shows three top mained heroes.
The third graph shows total amount of games played by each hero.
The fourth graph shows heroes’ winrates.
We can clearly see Ana’s dominance in a support role and an assault duo dominance with McCree and Genji. Zarya is the most preferred tank so far.