PShizzy
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I looked at both images, and it looks the images aren't focused well. Also looks like very thin DOF. in the first image, the sneakers have a lot of detail, and the grass tells me that the focus lines up there, but as she is moving forward, her face may not be in the DOF range
It's hard to tell but you may be shooting at too low of an angle, and when you shoot up, anything that's above the focus point gets looks back focused, and anything below looks front focused.
If it's just a front/back focus issue on the camera, then you could maybe calibrate the camera. I have a cheap chart thing I got off B&H and it worked great.
Another possibility: check the screws on the lens where it mounts. I lent a friend a 400 2.8 and he had the same issue and it turned out the screws weren't fully tight. Not enough that it was wobbly, but enough to mess with the focus.
After that, heat/haze, reduced contrast and even chromatic aberration could all be coming into play.
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