I took this image with my wife's combo as we believe hers would focus better than mine.
At the end the comparison (switching gear between the two of us was inconclusive)
Thanks for looking.
Canon 7D Mark II
Canon 100-400 f 4.5-5.6 L IS II.
ISO 640 (this is my limit for the 7D hence the longer shutter speed)
1/1600
f 5.6