Phillip Lynch

I think the Canon 5DIII was the last make canon with a removable button cell backup battery, all the newer cameras its built in.

I would like to hear the cause and solution

I am no expert, but I can guess that since the battery and camera is new a few things may be happening at the same time. 1. The camera's internal battery(super IC) is being fully charged ie first ...

Just a wild guess but your memory card may be slow.

There is a new firmware 135 for 5DIII as well .

Well said and I too have come to the same conclusion the colour(color) bias is in the optics and Canon have moved ahead with better overall optics.

what was your shooting settings RAW or jpg

This was my first digital camera, did plenty of work with it and it did video too LOL.

its a fact Canon last two 16-35 is better than EF 16-35 F 2.8L but AFMA it dial it in and you could be surprised its older tech that took -5,shows more distortion,sharpness ok at 16-20 but is hard ...

I would like to how that sensor stacks up against the 5DIV