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Apple claims its A6 chip at 1.3 GHz is powerful, but it won't sacrifice speed for battery life. The S4 will have an octo-core clocked at 1.6GHz or a quad-core 1.9GHz.
With Apple's wireless and LTE, the iPhone is said to support more networks all over the world to "connect at blazing-fast speeds, no matter where you are". The Galaxy 4S promised global 4G LTE networks support, along with super-fast download speeds.
The iPhone 5 has an 8-megapixel camera, but Apple says is the most popular camera that lets anyone take good photos. It says pixels aren't everything. Samsung is, of course, saying the opposite. Their camera sports 13-megapixels, and can record simultaneously in conjunction with the front-facing 2-megapixel sensor.