I own Mafia 3 on PC. I'll download it (41GB *sadface*) and give it a shot on my 780M GTX. Not expecting much, but I'll report back.
I played for about 45 minutes before having unrecoverable graphics issues, it was impossible to save or even switch to another application, needed to Command + Q to quit. The game also looks absolutely horrendous at 1080p on Low. FPS was about what I expected, 30fps at said settings. This is demanding game.
lol i am not gonna hurt my eyes by playing it on LOW