I would appreciate some advice on which way to proceed.
I have 2 Canon 5D Mk IIs one which I use for all types of photography, and one which I keep for back up. I use this camera predominantly for wedding and wildlife photography.
However, I am thinking of trading in one of the Mk IIs towards the 1D Mk4. I would then use the 5D Mk 11 for weddings and portraits, with the 1D Mk4 as backup, and then use the 1D Mk4 for my wildlife and bird photography.
What I have been finding is that the Mk II is taking a little bit of battering and I am getting dust and debris in the viewfinder and on the sensor. My thinking is that the weather sealing on the 1D Mk4 would be much better suited to wildlife and bird photography.
Any comments on how sensible a move this would be much appreciated.

