Processed using ACR 5.2 with WB reduced to 4600 (the furthest extreme before encountering a very cold blue look) which greatly reduces sky noise. Please download the full size file if you wish, to experiment with Photoshop perspective and lens corrections (or indeed, correcting the colour). The next example is a (fully corrected) modified export at 5000K, checked to see when the sky began to acquire too much red channel noise (anything over 5000K, and the blue begins to look noisy). This export used the original Adobe 4.4 ACR profile, the next one uses the new Adobe Standard profile for the 7D.