The 35/2 I had was lacking in contrast at f/2, things got better at f/2.8 but not amazing. It was fine at f/4, but I never liked the rendering of the bokeh on this lens, very distracting I found.
Don't forget that beyond f/11 your results are going to be deteriorating due to diffraction, not sure of the D4 sensor spec but certainly on the D800 people were reporting diffraction softening at f/8-f/11