It is not miss focus, it is motion blur. What was the ambient and what is lighting the background?
How can I be so sure it is motion blur? Put the crop in PS and Smart Sharpen, change Gaussian Blur to Motion Blur and rotate the dial. If it was miss focus the sharpness would be consistent wherever you put the dial, if it is motion blur there are positions that make more difference than others, this image changes as the dial setting does so it is motion blur.