Hazy objects in the foreground are always darker than the sky: they are never lighter than the sky, as seen in this video.
This seems to be a common mistake among computer graphics programmers, even though landscape artists know better than to have the sky darker than the mountains in front of the sky. The objects in front are always darker than the sky behind them, and the objects farther back recede into the background mist, which is the color of the sky.
Unless depth of field could follow my eyes and know exactly what I'm focusing on it's pointless and I would not want it.
@Dasim64 You're absolutely right. You don't move the center of the screen to where you yourself is focusing. Times you do this is in combat and conversations and even then you're also orientating yourself with your surroundings only using your eyes not the center of the screen.