a lot of people have opinions about the Leica 50/1 Noctilux, 50/.95 Noctilux, and Voigtlander 50/1.1 Nocton.
No one else that I've seen offers such complete comparisons as Jeff Hapeman. All shots done on M9.
Images are compared from all 3 lenses
images side by side
from wide open to f/16,
from 1) upper right 2) center 3) lower center left
so for the 3 lenses, you have 9 comparison shots for each f/stop
On top of that, the mosaic like pattern of comparison images
are reproduced in SEVEN sizes
which are linked just above the mosaic
from square (75x75)
to original (5487 x 5391)
Jeff made his own conclusions, but you have enough data and samples there to make your own.