offcamber wrote in post #15610800
I was in the same boat. I had CPS send me a 1DIV for a couple of weeks to try out, then the 5DM3 for two weeks. By the 2nd day with the 5DMark III I'd made my choice after shooting in a poorly lit arena for some barrel racing shots. The shots I got at ISO12800 blew the 1dIV completely out of the running for me. I can deal with a few FPS less and just time my shots better. When I need a couple more fps or a bit longer reach, my 7D works great and honestly I didn't find that the 1dIV's image quality was significantly better than the 7D's.
And this is where the differences B/T the two bodies are. 5D3 is noticeably better in low light than the MKIV especially if you need servo...Then its not a contest. 5D3 spanks the MKIV in low light with servo use.. just no contest really. I never had problems with the MKIV in One shot in low light, but, many other reported issues. If your gonna be in low light a lot, i would lean 5D3,, if not, advantages to the MKIV over the 5D3 in good light.