According to the latest rumors, Canon is currently testing two test units (different sensor resolutions) of Canon EOS 5D Mark IV camera: 18MP and 24MP. And the 24MP sensor version should be the final outcome. The continuous shooting speed will be less than 8 fps.
As you know, Canon spent a lot of money on 5D Mark IV project, so we can expect a big jump in features and performance over the more-than-capable EOS 5D Mark III.
A report (thanks) of 5D4 testing, where there is still a mix between 18 and 24MP. 24MP is the likely final outcome, with the lower MP sensor testing AF speed and buffer management issues (less than 8FPS is the likely shooting speed).
Stay tuned for more info.
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