If it's a director's program, such as a digital movie, this machine is good.
Planning to shoot a documentary, such as a wedding, is not very reliable.
There is no limit to the recording time, but the file is too large for the card to record for a long time.
There is no damping zoom when shooting, and holding it down means there is no push-pull function.
Later, it can't be used directly, so it can only be called by Da Vinci software.
That's about it.
From the aspect of image quality control, it is naturally better to use RAW format equal to the later parameters.
As for the comparison with 5D3, it depends on what you plan to do.
For information about cameras, please refer to my Baidu space.