maggieo
More Deadly
I've got both and can take a shot later today, but here they are on my Leicas:

Zeiss C Biogon 35/2.8 on Leica M9-P, January 26, 2013 by Maggie Osterberg, on Flickr

Leica M8 with 35/1.4 Voigtländer Nokton Classic, September, 2008 by Maggie Osterberg, on Flickr
The Nokton is chubbier, but shorter. Both handle fantastically. The Biogon appears to be magic, whereas the Nokton is merely very, very, very good.

Zeiss C Biogon 35/2.8 on Leica M9-P, January 26, 2013 by Maggie Osterberg, on Flickr

Leica M8 with 35/1.4 Voigtländer Nokton Classic, September, 2008 by Maggie Osterberg, on Flickr
The Nokton is chubbier, but shorter. Both handle fantastically. The Biogon appears to be magic, whereas the Nokton is merely very, very, very good.