Yes, I'm debating at the moment whether should I change my 6D to 1D MK IV as there's a good deal at local shop where they're selling used 1D IV bodies for 1700€. I can get around 1400€ for my 6D. I recently changed my 5Dc to 1D MK III to get better af system and it's nice to have two different formats at a wedding shoot because then I have better coverage when talking about focal lengths. I was thinking now would it be silly to change my 6D to 1D IV as well? I would get a superior af and better handling for a low price. Come on, it's the 1D IV! I never thought I'd be even thinking about it. But there's a thing that makes me hesitate and that's the fact that I would lose full frame and outstanding ISO performance of the 6D. It surprised me a little that 6D was so much better than the 1D IV in higher ISOs. Many say that the 5D III is so much better than The 1D IV in every aspect so should I just hold on those 300€, keep shooting with the 6D and save some more for the 5D III? I love my 6D but I'm don't trust 100% to it's AF capability when it comes to moving people etc.
As the title says, I shoot mostly weddings but every now and then some portraits, landscapes and some little action like dogs and little children.