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did you add the sky in Photoshop or use an HDRI Sky in the environment slot? i always render with an HDRI Sky but it look really blurry great job!!!

If you render with iRay you can use iRay Manager Script (http://www.infinity-vision.de/iray-manager-v3/) where you can setup environment resolution. But in most cases I add sky in post because sky backlates mostly have bigger resolution than HDRIs.