There have been lots of third party lens come out now for the Nikon Z range of cameras. From high end to very low cost.
Voigtlander have released a mix of current and older lens designs, so if your after clean and sharp or something with more character they will have something in the range.
There new 35mm will be out in July, so if your after a fast 35mm f/1.4 that’s not too big and you do not mind it being manual focus, have a look.
