National Geographic recently published a beautiful photo essay about Scotland using only the camera on Apple's iPhone 5s.
Photographer Jim Richardson has a great quote:
"With intense use (I’ve made about 4,000 pictures in the last four days) I’ve discovered that the iPhone 5S is a very capable camera. The color and exposures are amazingly good, the HDR exposure feature does a stunningly good job in touch situations, the panorama feature is nothing short of amazing—seeing a panorama sweeping across the screen in real time is just intoxicating."
What does this essay demonstrate? That the device is capable and that a good photographer can do amazing things.
I really recommend you read the great article and see the incredibly beautiful pictures.