And the 1D IV vs......
It lost its f/8 edge over the 1D X.
So now it comes down to an extra stop of usable ISO vs a 1.3 crop factor?
The reasons I haven't upgraded are becoming fewer.
Against the 5DIII I would think the 1D IV would be preferred.
For birds/wildlife, I'd take a 1DIV over a 5DIII, and a 1D X over a 1DIV. Initially, I had been considering replacing my 7D with a refurb 1DIV. But after shooting for a while with the 1D X, I dont' really see the point...
And now that the 1D X officially supports 5-pt f/8 AF, the key advantage the 1D IV had over the 1D X is now gone.