According to Chair co-founder Donald Mustard, who introduced the game during Apple's September 10 iPhone event, Infinity Blade IIIis able to run five times faster on the iPhone 5s than the iPhone 5, thanks to the considerable improvements to the hardware in the 5s.
Earlier today, the game was updated to take full advantage of the 64-bit processor in the iPhone 5s, featuring full screen anti-aliasing, bloom, full screen vignettes, distortion, high resolution shadows, and environmental reflections.
Our sister site TouchArcade has gone hands-on with a newly released iPhone 5s running the newest version of Infinity Blade III to test out the game's performance enhancements, providing a high-definition video showcasing Infinity Blade III's gameplay and graphics (a video of the unoptimized version of Infinity Blade III is also available for comparison).
TouchArcade notes that while the game runs better, it is difficult to ascertain graphical differences between the two versions unless looking closely. The site has also provided several screenshots that compare Infinity Blade III's graphics on both the iPhone 5 and the iPhone 5s which reveal minor improvements.
Infinity Blade III can be downloaded from the App Store for $6.99. [Direct Link]
Apple's iPhone 5s went on sale this morning and is currently seeing 7–10 day wait times for new orders.