In tech-speak, the iPhone 5S gets the same depth in focus as a full-frame DSLR at f/18. With a phone, you can freeze everyone along the length of a candlelit Christmas dinner table, and keep them all in focus. None of these DSLRs can do that, as f/18 and short shutter speeds don’t mix in candlelight.

Digital Photo Review have a brilliant article and I highly recommend heading over to read the rest.