None of that. I was superbly happy with the 5D2 except for the often flaky AF performance. That was my sole driving decision in going to the 5D3 and boy have I ever been happy with it. IQ and ISO performance are more than adequate for my tastes. I was always hesitant to take the 5D2 up to ISO 3200 but don't even blink when shooting 6400 on the 5D3. I love the menu interfaces and customizability of the buttons. Accuracy of AI Servo mode compared to 5D2 is in a completely different universe. I'll shoot the 5D3 until it dies.
What upgraded feature would push you to get the mkIV?
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