Canon has announced it will make C-Log available to current EOS 5D Mark IV owners by way of a $99 feature upgrade. The update, which includes an unspecified hardware change, will be available at Canon's service centers in the US starting July. C-Log will also be pre-installed in new 5D Mark IV bodies starting July, retailing for $3599.
The camera's internal capture and output remain 8-bit 4:2:0, so it is unlikely to match the degree of gradability that's possible with the 10-bit 4:2:2 footage captured with cameras such as the C700. We're told the Log curve is the same across both cameras, though, to make it easy to match footage.