You asked
Is the voigtl nder nokton 58mm f 1 4 sl iis good for portraits?
Yes, it's a good portrait lens, with two caveats. On full frame, 58mm sits between the 50mm and 85mm that portraits recommends, so it gives a natural, slightly tight view with nice background blur at f/1.4. On an APS-C body such as the Nikon D7500, it frames like 87mm, which is close to the classic portrait length.
It's manual focus and not stabilised, so you'll need to focus carefully, especially wide open. If you want autofocus, look at the portrait lenses on the Voigtländer Nokton 58mm f/1.4 SL IIs page's neighbours, or start with the 50mm f/1.8 from the portraits guide.
Written by Claude from this site's pages.