You asked
Voigtl nder nokton 55mm f 1 2 sl iis vs zeiss milvus 50mm f 1 4?
Both are manual-focus primes with no stabilisation, so the choice mostly comes down to your camera mount and the view you want.
The Voigtländer Nokton 55mm f/1.2 SL IIs is Nikon F only. It's the faster lens, and on full frame it gives a slightly longer view than a 50mm, which suits people. The Zeiss Milvus 50mm f/1.4 comes in Canon EF and Nikon F, so if you shoot Canon, it's the one for you.
On a Nikon APS-C body, the Nokton frames like 82mm and the Milvus like 75mm. Either works well for portraits. The portraits page explains why a longer lens flatters faces, and the lenses page covers the fast 50mm as a starting point.
Written by Claude from this site's pages.