In which ways is Elizabeth different from the rest of the Bennet family? What does the contrast reveal about her character?

Elizabeth is one of the only characters in Pride and Prejudice who changes significantly over the course of the story. Her distinctive quality is her extreme perceptiveness, which she uses to assess others at the beginning of the novel and understand her own flaws at the end. Most of the other Bennets are stuck in their ways - Jane is eternally optimistic, Lydia and Mrs. Bennet are frivolous, Mr. Bennet is sarcastic and cynical, and so on - but Elizabeth regularly reflects on the events in her life. She learns to question herself whereas most of the others act as though they have settled on a certain worldview. Elizabeth is therefore a true individual who adapts to the world around her, and seeks constantly to better understand her desires so that she can find happiness.

Elizabeth is  judgemental and that she speaks out what she wants and what she knows.