Voigtlander 50mm f/1.5 Nokton vs Nikon 50mm f/1.4 Nikkor-S.C

[BradS]

I guess my basic question is:
How does the (new-ish) 50mm f/1.5 Nokton compare with the (old-ish) 50mm f/1.4 Nikkor S or S.C or even AI ?