This demonstration is reason enough. Created by Rishi Kaneria, this video shows you just how awesome what you can do with 120 frames per second in your pocket. Also, it matches the GoPro Hero 3.

Here's Apple's video demonstration on the iPhone 5s camera capabilities. http://youtu.be/kK0_OVn_uxA

I originally titled this article "iPhone 5s...OMG I WANT" but thought that was too crazy. It's late.