I have both lenses and they are different so it depends on what you are looking for:
N 85 has smoother bokeh,faster and is more of a portrait lens as it's sharpness drops off towards the borders.
C/Y 100/2 Planar is sharp across the frame with less smooth bokeh.
I would use the N 85 more for portraits and narrow DOF shooting and I would use the 100/2 Planar for landscape and environmental portraits where you would want to show more detail in the background bokeh.