Not a bad set of images at all, for what they are. :thumbup: The blue in #1 is a bit over the top for my taste, and in #3 the building distortion is too much. Overall, looks you did a good job with your exposures, and I like your composition in #5 - nice work.
I just purchased the Sigma 10-20 and hope to start making some shots similar to this is Atlanta (our tallest buildings are condos on the beach - yuck and I so hate tourists). Nice work but for a suggestion: try shooting some about 30-45 minutes after sunset. Oh, and those clouds...you know how it goes..."and it never rains in Southern California..."