The truth is with the Knight you know there's more to him. He fought in the Crusades for Christ sake (not to mention hoards of other wars) and probably has more blood on his hands than any of the travelers. With the many translations of this tale, its hard to know exactly why Chaucer portrayed The Knight as a perfect seasoned warrior with a gentle spirit. That said, his tale was entertaining to say the least.
Interesting fact, which I didn't know was Shakespeare and John Fletcher co-wrote and adaptation of Chaucer's The Knight's Tale with The Two Noble Kinsmen.