Professional gamers tend not to worry too much about colors. They will purposely turn graphics settings to Low/Medium, shadows off, minimal visuals, in order to eliminate distractions and increase fps which decreases lag. Professional gamers do not care if they can see the hairs or color differences in the beard of the bad-guy as he comes around a corner, they only want to see When he is physically coming around the corner, too much lag and he is around the corner faster than the screen shows, and they are dead.
You want ping low, lag low, graphics low, fps high. Use wired mouse and keyboard to minimize input lag. Use Display Port to minimize frame caps, no g-sync or free sync unless necessary.