Now try to shake the camera, can you hear loud knocking sound? If you can then something is loose inside... Time for a trip to service center.
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Test #3. Same lens, EF 70-200 2.8 II IS, RAW
(1) EOS-M, 125mm, 1/160, f4.5, ISO100, flexizone single, on monopod
(2) EOS-6D, 200mm, 1/1500, f2.8, ISO400, AF, on monopod
I intentionally used a higher ISO on the 6D shot so I could use a faster shutter speed to minimize effects of camera shake on the monopod, so if anything the 6D should have an advantage there.
The white balance was messed up on the shot from the M, but I don't have access to Lightroom or other software to correct it. DPP probably can do this, but I'm not familiar with it.