Well yes. One should compare Voigtlander 58mm f/1.4 with the Nikkor G 58mm f/1.4 and not with a f/1.2 lens which has a smoother bokeh by definition (and is less sharp).
Bokeh isn't necessarily "better" in an f/1.2 vs f1.4.
Quality of bokeh is affected by
how the OOF elements are rendered, not just because it's wide-open.
I have read many who try to compare the Voigtlander 58mm f/1.4 and the Noct. Nikkor 58 f/1.2.
I can see the reason for this comparison, also, as they are both metal, all-manual (pleasing-to-use) lenses, whereas the G is another cheap, plasticky AF lens.
However, the G is in the price range of the Voigtlander and it's a f/1.4 like the Nikon.
So I guess it depends on what you're "focusing on" (pardon the pun)
John, you seem to be considering lenses at "exactly" f/1.4 in the 58mm range only
However, since I started this particular thread,
my quest is comparing 50-ish
fast, all-manual lenses ... which means the 58mm f/1.4 G isn't a thought in my head in this comparison.
This is why I asked about the
all-manual, fast 50mm f/1.2 Ai-S versus the
all-manual, fast Voigtlander Nokton 58mm f/1.4 SL-II.
IMO, the all-manual, fast Noct-Nikkor 58mm f/1.2 is the closest comparison, but the latter is out of my desired price range. I just don't see it being worth $2500 more than either lens, except as a collector's item.
Still, many have made this comparison, as they too are regarding them as fast, all-manual 58 mm lenses.
Jack