Andrew Lincoln is one of the best British professors of New Testament. He does a great job at bringing out the meaning of John's Gospel. He presents convincing evidence that the writer of this Gospel knew the other three gospels, and that he used them to create his own portrait of Christ and His ministry.
Lincoln believes that many of the miracles that Jesus performs in John are not historical, and that the healing of the paralyzed man by the pool of Bethesda is basically a rewrite of Mark's story of the healing of the paralyzed man who was lowered through the roof of a house.
The discussions between Jesus and the Jewish leaders were designed by John to show that even though the leaders were putting Jesus on trial, He was really putting THEM on trial!
Lincoln marshalls a lot of evidence to show that Lazarus could be the disciple who Jesus loved, and then he goes on to say that Lazarus was a made up person. I am not convinced.
Lincoln does maintain that John is probably more historically accurate about the trials of Jesus on the night of his arrest than the other three Gospels. He thinks that it is very unlikely that the Sanhedrin would have tried Jesus on Passover night, and that's why John left that part of the Passion of Jesus out of his Gospel.
I agree that John knew the other three gospels and that he sometimes chose to go his own way for theological reasons. Nevertheless, I am not always clear why this means that the stories and conversations in John are by necessity non-historical. Wouldn't it be better to say that historical events in the life of Christ were written down in artistic and creative ways for the purpose of winning people to faith in Jesus? (This is after all, what John 20:30-31 says!).
Although I disagree with some specifics, I must say that this commentary was very rich and rewarding and I learned a lot.