First, the new apple design A6 chip is the processor unit which is x2 faster performance than iPhone 4s.
However the power saving ability is better and give iPhone 5 up to 8hours of 3G and LTE, and 10hours of wifi Internet.
For the first time, Apple changed the screen size of iPhone to 4 inches, remains 326 ppi but 40% better color saturation.
18% thinner and 20%lighter. It's the world thinnest phone yet - 7.6 mm thickness and weight - 112 gram.
3 speakers instead of 2 to enhanced sound quality.
Slightly better camera.
200 new features with iOS 6.
Benchmark test of iPhone 5 is currently beats galaxy s3, oneX and nexus 7.