You can run the benchmarks yourself!

http://www.webkit.org/perf/sunspider/sunspider.html

It's not convenient, but you can always go back to their 5s review to see the 5/5s difference.

http://www.anandtech.com/show/7335/the-iphone-5s-review/5

Yeah. And 4 and 4s. I'm interested in what upgrading will give me, not really how it compares to other high end phones (not switching from iOS). I doubt many 5S users are upgrading to 6, but a lot of 4S and 5-users.