Hi all, I currently have a Canon 6D, and want to upgrade to a 5D. The question is a mark 3 or do I go and spend the extra cash on a mark 4?? I have researched both online but can't decide! I want to also buy a wide angle lens for interior photography, if I go for the mark 3, I can afford a better lens, I'm really on the fence as to which camera to opt for. Any advice would be fantastic! Thank you.