Hmmmm. Look at Doug, and his "Mankind" ad. The lighting looks like i was done in the street. Bryce's "Delay" ad, with the lighting hitting his rather shiny head on his left, coincide with the last part of his video when he moves out of the black drape frame.

You dont reall need to do it in the street. Weather in New York in which i think where Doug shot his ad, allows for this, since New York sun arent as blinding as what we have here in KL. I agree that the result will be much better in a sudio controlled environment though. But that doesnt allow an impromptu setup like when you wanna do this on the spot, where an iPhone user is currently using his or her iPhone.

The raw footage will have all these imperfecions you mention, but with post production, you can make it look like those ads. Crush the blacks, and isolate the dialogue from the ambient noise. Even the speaker could wear a concealed mic. Easy enough, make it green-screen, and slap a different background altogether! It's all in the post production, and since this is an ad, worth between 3-5 minutes long, the post producion period ont be that lengthy.