You asked
Is the voigtl nder color skopar 18mm f 2 8 aspherical good for street photography?
Yes, I think it's a good street lens. On a Fujifilm X body, the 18mm frames like a 27mm on full frame, a classic street focal length that's wide enough to show the scene and close enough to tell the story. At f/2.8 it gives about the depth of field of f/4.2 there, so a good part of the frame stays sharp for quick shots.
The catch is that it's manual focus only. You'll need to set focus by feel or by zone focusing, which takes practice but suits street work once it's second nature.
For the body, try an X model such as the Fujifilm X-E4 or Fujifilm X-E5. APS-C is plenty for this kind of shooting, as the sensor guide explains. And whatever you shoot, be open about photographing people. The Street page has more on that.
Written by Claude from this site's pages.