http://www.nikonchat.com/nikkor-1-4-lenses/

What would be the portrait of the best lens for my Nikon D3100?
My options are 85mm f/3.5G ED VR or 50 mm f / 1.4 or Nikon 85mm f/1.4D AF Nikkor? What is ED is and what is the difference between yf/1.4D f/3.5G ED in 85 mm? I'm about to make a purchase and do not know if I'm the best for the big picture and outdoor nature. I like the blurred background effects much and I know that all three of these lenses do the trick?
The best portrait lens use in a D3100 is the AF-S 50 mm f / 1.4, as it is a medium telephoto lens used by many portrait photographers. 85 mm lens is best used in a full frame DSLR or 35 mm SLR camera to shoot pictures for the same reason. Ensure that any goal that you buy for your well-D3100 is an AF-S, so that the approach D3100 automatic in its ED from Nikon is what he calls its high-end lenses with extra-low dispersion lens elements that http://www.nikonusa.com/Learn-And-Explore/Nikon-Camera-Technology/ftlzi4z6 / 1/Super-ED-Glass.html
nikon d7000 w/ Nikkor 1.4G lens