Matthew - Supremacy of Christ (Sovereign King)
Mark - Service of Christ (Servant)
Luke - Sympathy of Christ (Son of Man)
John - Sufficiency of Christ (Son of God)

Matthew - Christ is Lordly
Mark - Christ is Lowly
Luke - Christ is Lovely
John - Christ is Lofty

Matthew - His authority
Mark - His activities
Luke - His affection
John - His attraction

Read Part 1, Part 2, Part 3.