Donald - One question is whether you need as much at the bottom and on the left, or would a crop that tightens the frame up on the opera house, have more of an impact. The reason I say this is because you really have the lighting on the 'sails' and I think it looks spectacular when you isolate them.
Spectacular lighting indeed. Nicely captured. I also agree with Donald (the Scot) on the crop.
Dave
Thanks, I'll work on that.