Help Edit Photograph of Sydney Opera House

I have a photograph of the Sydney Opera House which was taken about two and a half years ago when I first got into SLR photography.

I took this on the 16-50mm f3.5-5.6 pancake kit lens that came with my Sony NEX 6.

Looking at the EXIF, it was taken on 20mm forcal length (APS-C) at f/4.

Anyways, can you please help me edit this photo? I tried but I could not get it to look half decent. You can download the RAW file through my Dropbox at https://dl.dropboxusercontent.com/u/84263913/DSC01458.ARW.

Thank you very much.

Sydney Opera House - 23/09/2014