I do have the same strange effect here as in this one.
The whole seems to be blurred but the bird and a part of the fence are in focus. My guess (for the moment) is that it is the combination of this lens and moving it while shooting.
So I'm not the only one who notices that effect.
Didn't like it in the sports image but like it here. Maybe it's because the focus is more selective or because the bird and the area of focus on the fence don't line up. It looks like you glued a picture of a bird in that location.