Been to Laguna or Malibu lately? The sun is ALWAYS behind the cliffs, then directly overhead, and then over the ocean. Maybe there's other beaches I'm not familiar with, but Laguna is 20 mins away, and Malibu 45....I don't feel like driving down to SD or Ventura to explore, and I doubt any agencies want to send models that far either. If this were Miami, then it'd be a non-issue. But since it isn't, and I actually like being able to capture more DR in my images, especially given the way I prefer to shoot stylistically...I'll stick with my earlier comment that it's a useful thing to have (DR that is).
ETA: and before anyone else asks "Well why can't you just do blah blah blah"...I was just pointing out a situation where DR came in handy, for the fanboys who think it's pointless and the 5DIII is acceptable for every situation. If you like Canon and think 10-11 stops of DR is good enough for you then good for you; but not everyone shoots the way you do, and some people might be better served elsewhere. Not being a contrarian...I tell plenty of people to shoot Sony, Fuji, Canon, etc depending on their needs. But since the OP specifically mentioned wanting the one thing Canon can't offer, in this case I can't suggest a 5DIII.