How is Siddhartha different at the end of the story from what he was like at the beginning, or with Kamala?

How is Siddhartha different at the end of the story from what he was like at the beginning, or with Kamala?  What does it mean to be enlightened, according to Hesse (assuming that Siddhartha has achieved enlightenment)?  How is he different from the people he ferries across the river?

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