Why is the Gospel of John said to present Jesus distinctively as "the Son of God"? A common assertion is that the Gospel of John uniquely presents Jesus as "the Son of God", while Matthew presents Him as "the King of the Jews", Mark as the "Servant", and Luke as "the Son of Man".

What is peculiar in the Gospel of John that gives rise to this particular distinction?
This idea comes primarily from the presentation of Jesus throughout the Gospel, which is summarized nicely by the Biblical author himself:


  Therefore many other signs Jesus also performed in the presence of the disciples, which are not written in this book; but these have been written so that you may believe that Jesus is the Christ, the Son of God; and that believing you may have life in His name. -John 20:30-31


For example, consider the closing statement in the first section (1:1-18):


  No one has seen God at any time; the only begotten God who is in the bosom of the Father, He has explained Him. -John 1:18


...or the climactic statement of John the Baptist at the end of the second section (1:19-34):


  I myself have seen, and have testified that this is the Son of God.” -John 1:34


...or the climactic testimony of Nathanael at the end of the third section (1:35-51):


  Nathanael answered Him, “Rabbi, You are the Son of God; You are the King of Israel.” -John 1:49


The trend continues throughout the Gospel.