The built-in cameras on smartphones are getting better and better with each new phone release. Some phones' camera lenses and features are so good that they rival basic point-and-shoots, prompting users to ditch their stand-alone cameras. Paired with photo-editing apps and the ability to instantly share our work, phone cameras are often easier to use, even if that means sacrificing some of the manual settings that come with regular cameras.

But what about for professional purposes? For this story, we equipped three professional photographers with three smartphones that are the camera leaders for their respective mobile operating systems: the iPhone 5 on iOS, the Nokia Lumia 920 on Windows Phone 8, and the HTC EVO 4G LTE on Android. These pro photographers took their phones on shoots, and swapped out their full DSLR setups to snap a few styled shots with these smartphones, often making use of the apps that nonprofessionals use every day.

Here's what they came up with. CLick here