I just got the 100-400ii as a refurb and have been playing around with it. I've done some MFA adjustments, but I think they still need some tweaking. I focused on his eye and you can see where the depth of field is falling on the stone pretty well. I was getting some variance in the focusing, but that may be the 7dii. I still need to use it more to get a better feel.
The last bit of summer sun_CAG_4742 by Chris Garza on Flickr
I'm viewing on a small tablet, but assuming you were shooting slightly downward, it actually looks pretty darn close to spot on. His face is in a shadow so perhaps that is creating a perceived softness.