Hi Kris,
Here's the retouched portrait, as promised ... hope you like it! (I made it 1200 x 800px, so be sure to click on the image to see it looking it's best).
Right - having just said that - something else I NEED to say ... I don't know if it's your lens - or technique - or something else, but the focus on that shot was REALLY bad ... and from what I can see above, they all appear to suffer from the same issue. I had to do some seriously nasty stuff to the file to get it looking even 1/2 acceptable (to the point where it was clearly causing damage in other areas of the image) -- so I think it's something we need to investigate further.