check this out and compare yourself:

http://1.androidauthority.com/wp-content/uploads/2012/09/iphone-5-vs-gal...

S3 has NFC chip and S-Beam which is not even there in Iphone5

Iphone5 needs nano sim - which is a micro of micro sim, It has different charger and no much big deal than iphone4s except improved processor and wifi receiver.