Most of my work is photographing houses for estate agents in Cheshire, England. I have chosen the Panasonic M43 route and use the Lumix G5 body. I can't see the point of paying out for features that I'm not going to use and I put my investment into the faster lenses being produced by Panasonic. My workhorse lens is the 7-14mm f4 (14-28 eqiv) usually set as wide as possible. Panasonic gets my vote.
9/2016I Still Use A Canon 5D Not listed in the Poll, also been known to use my iphone 6s, with attached wide angle lens, my go to apps are AutoBracket, and ProCam