I've noticed that Overwatch offers a graphics option called "Screenshot Quality". I've set the quality to 9x resolution and taken a screenshot using the Prt Scr key on my keyboard.
After looking at the screenshot, I have to wonder what the option did exactly. The screenshot's resolution is the same as the resolution I play at, and since I can still see aliasing, it's obvious the internal resolution wasn't increased before taking the shot.
Since I can't find a "Screenshot Key" in the Controls option, I can't tell if the Prt Scr key was the correct key to press, though.
What does the "Screenshot Quality" do exactly, and how would I take a screenshot to properly see its effects?