[My reaction to the May 1-6 NT readings from the One Year Bible]
Wikipedia provides a pretty neat summary of the shared material in the synoptic Gospels. John, on the other hand is a completely different beast. It is thick, thick, thick with theology. It establishes in Chapter 1 that Jesus was the Christ and existed for all time. In Chapter 2, we get wedding miracle, then right off the bat, he's clearing the tables. It establishes in Chapter 3, that faith in Christ provides access to eternal life. It establishes in Chapter 4 that this offer extends to people other than the children of his religion.