Hey mate. had a look at that image and it doesnt seems like camera shake at all.
looks like is back focused. The hair and the collar look in focus?

1. If you manually selected the AF point with expansion its probably focused on the areas of the collar or hair as its higher contrast

2. If its not the AF did you do mirco adjustments to the lens? If so you better check it out.

3. Did you focus and recompose? was it one shot AF? if thats the case then might have moved after your recomposed.