If you also want to try to shoot HD movie then the choice would be quite obvious. For stils, I would look for Credo 60MP in stead of D800E for absolute image quality, unless low light performance, superfast autofocus or fast frame rate is absolutely needed. In reality, all the high paid jobs does not require super high-tech cameras, super high ISO shooting, and superfast frame rate, quite interestingly, on the contrary, the lower pay job might require those, due to limited budget. This is not to say D800E is not a good camera, it is a great camera that I also own one. But Credo 60MP, like my P65+, still visbly above D800E on absolute image quality.
But of course, as most of the professional photographers I know who shoot medium format, all have their Canon or Nikon, and perhaps more SONY would appear.