I can't say much for the 35mm focal length Zeiss or Leica. But I have nothing but amazing things to report about the 35mm f/1.4 Voigtländer Nokton. Wide open it's gorgeous, and with a 25mm aperture you're right on for portraiture. Then, stopped down it's just incredibly sharp and makes perfect negatives to print.
All I'm saying is to not discount it. I've used one now for a few months, and am in love. It makes pictures that strongly remind me of the 80mm Hasselblad Zeiss Planar.