quetion about a noctilux

[Hacker]

do you realize any biggger diffrences between the Summilux 50mm f1.4 ASPH and the Noctilux. What would you say and how discribe it.
sem

The Summilux is tack sharp, focuses near, handles very well and is just flare free and contrasty.

The Noctilux is different, it has that "old world" look and 1 stop faster. Of course, I can have the old world look with other 50 lenses, but I just love the f1 aperture. The lens is of course sharp stop down and flare free, but I would only use it for certain kings of shots.