Focus looks ok to me. Maybe use something like f2.8-4 for that kind of shot. As you can see the DOF at f1.4 is razor thin, especially when you are close to the subject.
For comparison, here is a similar shot taken with Sigma 30mm but at f4:
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IMG_7345.jpg by M Whiten, on Flickr
For comparison, here is a similar shot taken with Sigma 30mm but at f4:

IMG_7345.jpg by M Whiten, on Flickr
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