...looks quite normal to me...
Its what I would expect, with the amount of Mist/Fog/Sun glare, etc, showing in the distance.
That's what it looks life in "real life"...

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My scenery gets progressively more clear and distinct as I get closer and closer to it....

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Everything appearing "clear" as far as the eye can see, is most un-natural...!
Stand on top of a tall building and note how far you can see clearly into the distance...not very far, on most days!...

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For realism, set your "distance" to 2-5 miles Max...

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Paul...G-BPLF... 8-)...!
...I would suspect that a1, living in downtown Los Angeles, can barely see 3 Feet in front of him on most days of the Week...

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P.S....I like your realistic "Cloud" effects...

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Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.