But those pictures would all be easily achievable on a smartphone?
They don't have extreme DR or shallow DOF.
Exposure control is available in iOS 8 as well.
Photo 1: DOF
Photo 2, 3, & 4: Dynamic range and exposure controls. I guess if there's an app to control those, then it would help, but the way it is now, I tap on what part of the screen I want to focus on and that's what it exposes for. Then I'm guessing it tries to compensate for the dark area as well and you get the noise. I'll do some experimenting later and play with my lights one day when I have some spare time.
Photo 5: Dynamic range & possibly lighting. This was either a composite, heavily edited image, or and image done with lighting. The sky is exposed so you see the colors and not blown out while the subject and foreground is exposed correctly. This was either done with some high powered flashes (because of having to kill the sun) or with several photos combine into a composite or with lens filters. It doesn't look like a single shot that was done with just a camera and lens. I could be wrong, but that's what it looks like to me.