Currently I have a 7D (two years now) and it was an upgrade from a 40D. I really like the improved auto focus and the metering. So far I have not tried video as I have focused only on stills and improving my knowledge of the functions of the camera.
I have the ef-s 10-22mm, sigma 50mm f1.4, ef 24-105mm f4.0L, and (my treasure) 70-200mm f2.8l II. I "think" I want the new 24-70mm f2.8 II but without IS I am disappointed and might go with the ef-s 17-55mm f2.8 IS. Speedlite 580 EX II, custom bracket, Manfrotto tripod and monopod.
I shoot a lot of low light (fast lenses and high ISO) AV and manual mostly. My subjests are primarely residental real estate, events and receptions (wedding assistant), youth sports, landscapes and just starting some photojournalism. Not much into studio portraits, although I am going to get some portable lighting so I can do some volunteer portrait work at church and local nursing homes. I don't crop a lot or print larger than 8x10 except some 10x14.
I realize the new 5DIII has some features that might be beneficial to my described work above, but I need some feedback from the experienced folks here to help me rationalize the $$$$'s for the new 5DIII. I was never tempted by the 5DmkII because of the focusing benefits of the 7D.
So, open up and lead me in the right direction. If I am going to the poor house with a FF I want it to fill a much justified need.