The Leica Noctilux-M 1:1,0 / 50mm is an iconic vintage lens.
Released in 1976 it is a lens from Leica's pre-aspherical era.
At its lowest f-stop of 1,0 it is extremely soft, unlike modern lenses, but it renders beautifully for portraiture and skin, with razor thin Depth-of-Field and a dreamy look.
Is ist an every day lens? Probably not for 99% of photographers.
But you can't argue with the beautiful analog look in a digital world.