I have 50mm Nikonf/2.8 and Apo Rodagon 50mm f/2.8 (without N, old model). The result, Nikon better. Two years ago I have a chance got a Leica Focotar 50mm f/4. From that time, I forgot those two lenses. My 90mm Apo Rodagon 90mm f/4 still for medium format, 6X6 lens since 1984.