Very nice shot! a lot of fist but gives the shot character 
Re fine tuning of focus, remember that many large aperture lenses, fast lenses, has focus shift as the lens is stopped down.
I have a feeling that Nikon adjust for around f/2 - f/2.8
Yes this is likely. But the 58/1.4 is advertised for its wide open characteristics:
"High reproduction capability of point light sources even at the maximum aperture
Sharp, high-resolution images can be reproduced even at the maximum aperture"
So how is one to focus it at wide aperture if autofocus doesn't work correctly or if fine tuning it for wide open use result in incorrect focus stopped down? (I'm not saying this is the case. Just thinking about the possibility. I generally pull back a bit to adjust this lens so that the distance to target is about 2.5-3m, as the softness of the lens at close distances can make auto fine tune fail. I've also fine tuned it stopped down a bit, but I don't have a firm recollection of which approach produced the best results.)
I have had a lot of grief with focusing with this lens, but it does have the capability of adorable results. Also stopped down to f/2.8 portrait images can be very beautiful. Nice colour and contrast, in particular, and ability to deal with backlight. However, at wide apertures and near distances it is very soft. This is just the characteristic of the lens and one can cope with it, but I wish it autofocused more consistently.
I nevertheless use the lens, but I've wrong wary of using it wide open as a general purpose fast prime. Portraits? Wonderful results. Documentary photography? Nikon's more recent 105/1.4 and 28/1.4 produce much sharper results wide open, and especially the 28 is very pleasing. The 105 has a bit too much swirly bokeh for my taste. I'd like to have a similarly performing 50mm or 58mm in the F mount as the 28 and (to lesser extent) 105.
I understand that Nikon likely wanted a lens where the in- and out-of-focus areas appear as natural as possible. In more recent lenses (by Nikon and others), it has become common to have the in-focus part really shout at the viewer (SHARP!). But perhaps I would prefer something in-between. Not soft, but not screaming sharp, either. :-) I actually felt the 85mm f/1.4 AF-S has been among the most pleasing of this generation of lenses. The 28mm and 85mm are probably my favorites. The 105/1.4 is nice in that it is so sharp it allows some cropped shots in indoor event photography, it allows freezing a moving subject effectively due to the large aperture and is sharp enough that it can take a crop without problems, and the result can still be excellent. But those swirlies and cat's eyes make my stomach spin. Tradeoffs, tradeoffs...
