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@M_V
As above, expect some softness wide open.
You say you used AF with a single point on the subjects left eye. This means you either used something other than the central focus point - which in my experience can be less accurate - or you locked focus and recomposed - which can definitely cause problems of it's own. Even if you breathed between locking focus and shooting you may have moved enough to put the focus way off when using a large aperture like that.