http://www.nikonchat.com/af-nikkor-50mm-f1-8d/

What is the difference between the Nikon AF 50mm f/1.4D Nikkor AF 50mm lens and F1.8D?
Well, besides the price, though …
1) Build Quality – means that a) feels better in your hand b) works best c) more "type of program … 2) faster 3) Best Bokeh 4)" sweet bokeh ".. sweet means more soothing to the eyes, no problems .. 5) better when you tryin u'r in an environment where you want something unique to any particular else .. say the nose is in focus, but they are the eyes … f/1.4D…personal get the recommendation … 1.8 / d is not tht good actually …
Nikkor 50mm f1.8D AF unboxing