Upgrade from iphone 4s to iphone 5s?

I have an iphone 4s. My upgrade is due in mid-october, and I think I want to upgrade to the iphone 5s. Is it worth it? I've never had an iphone 5, so I don't know the major differences.

Same thing. It hasn't changed much since the first iPhone in 2007. New iOS 7 brings minimal ui enhancements. But it's still more of the same. But that's apparently what people like.

To each is own

4s is 3G
5s is 4g -faster processor -fingerprint recognition
and larger screen

How much is it to upgrade from a 4s to a 5s?