Canon announces the 5D Mark IV (and two lenses)

[Kayaker72]

1Dx has 1-2 stops better ISO ability than a 5D3. I'd be surprised if a 5D4 can improve by >2 stops, enough to put it ahead of a 1Dx. On par, maybe.

Based on DPR, I thought I was seeing ~1/3-2/3 improvement of the 5DIV over the 5DIII at ISO 6400. Using DXO data, I see the 1Dx/1DxII at about a 1 stop improvement, the 5DIV likely is closing the gap at higher ISO, but still just a bit off in terms of DR. In terms of other parameters (tone/color/etc), they all seem very close.

EDIT- If I were to guess, I suspect the 5DIV will slip right between the 5DIII and 1Dx I/II above ISO 1600, but exceed the 1Dx and be just below the 1DxII for ISO 100-1600.

Of course, this is just DR.