I'm wondering why the OP asked the question. Did you think it was soft or did someone tell you that.
I think the focal plane is quite sharp and that the eyes are a tad soft by not being in the focal plane but this is not a fault of the lens or the camera but the DOF available by the aperture and/or you focused on the eyes and then physically moved the camera before you took the shot. That is easy to do when your DOF may be a few cm thick.




