For those interested, here’s a closer look at yesterday’s image taken with the Nikon 58/1.4G.
At f/1.4, you can see how the 58/1.4G has a slight glow; this is in contrast to the vivid sharpness of something like a Sigma 50mm f/1.4 ART. If sharpness is your only measure of a lens’ worth, then the Sigma is your lens of choice for the 50mm-ish focal range.
In all other respects (colour, bokeh, 3D effect, etc.), I would choose the Nikon.