Giant Defy 4 vs Defy 5 - is this really worth the difference?

[Dogtrousers]

Very sorry.................I meant the Defy 4 or 5...........both have Claris.

Ah ha. Makes sense. The only difference does indeed seem to be the fork

http://www.giant-bicycles.com/en-gb/bikes/model/defy.4/19187/77297/#specifications
http://www.giant-bicycles.com/en-gb/bikes/model/defy.5/19187/77298/#specifications