What are some of the major differences between Olivia and Nancy?

The differences between Olivia and Nancy are quite apparent during their lunch meeting. While Nancy might have been the more physically attractive sister growing up, clearly Olivia is the one with the more successful life now and who has her pick of men to consider when she chooses. Also, Olivia is on the cusp of fashion, power and knowledge, while Nancy languishes on the outside thanks to her boring, simple life filled with shallow appearances.