The trick I think with using a Canon is to tame that tendency of a Canon to show brownish skies. It must be some difference in the auto white balance where it makes dark skies default to a brown.
So I would try to get the brown out as the skies are not brown unless there is bushfire smoke. Most likely adjusting the white balance to a cooler temperature.
I'll never move back to suburbia, the night sky out here is just to dam good. 
