I dont think there has been another lens that has caused such a stir amongst Nikon shooters in a while. The 85mm 1.4G has done so since people can't grasp why this lens is costing the extra $$$$. I think I ended up paying a whole $500 more for the G over the D and rightfully so.
My experiences with the D were basically a lens that is optically great, very sharp wide open, amazing bokeh, average autofocus in terms of accuracy however the lens does have bad CA and it can't track moving objects for the life of it.
I've waited a while for a prime I felt could rival the 50mm 1.2L and 85mm 1.2L I used to have when I was shooting with Canon. I can now say first hand the 85mm 1.4G from Nikon is everything a photog could want and more. The focus on the lens is smooth and most importantly it can easily focus on moving objects even when the light is crap.
For all those wondering if the G is worth that extra money the answer is a big yes.