>Processor is up to 2x faster
>Facetime over LTE
>LTE
>Longer battery life, because processor is efficient
>Its taller (*I could care less truly) and thinner
>Better charger
>8MP camera
>Retina display (old but still great, no other phone has it)
*The phone was meant to fit in your hand really nicely, and you can reach your thumb around every corner of the phone. Phones like the Samsung Galaxy S III is like putting a goddamn tablet to your face, which is ridiculously stupid and inefficient for one hand operation.