I recently got a new toy for my Nikon Df, its a 50m 1.2, quite old, but in great condition. Cant really tell from when it is, but lens is sharp at 2.0, and if you manage to focus correctly at 1.2 surprisingly sharp as well.
Only uncomfortable thing is the focus range, to reach close up to infinity you have to move the barrel for quite a distance. Definitely manual focusing in the Leica is much much easier.
A few snapshots all shot with the nikon DF, hope to take more picts this weekend. (Portraits shot wide open).