===Pretty much every Canon digital imaging sensor for still imaging outputs pixel dimensions divisible by 16 for efficient JPEG encoding. Any edge/masked pixels are in addition to these dimensions. So the sensor will not be 8192x5455. It may be 8208 x 5472 or 8256x5504 or some other similar resolution with both sides divisible by 16.
In this case, I CAN AGREE WITH YOU as the JPEG macro-block size WILL be taken into account. So let us state that it WILL BE AT LEAST 8192 or 7680 pixels on the horizontal for video purposes and may be as much as 8208 or 8256 pixels on the horizontal for still photo purposes which means there likely will be video crop factors involved that are miniscule compared to what they used to be with the 5D mark 4!