08-09-2010, 09:40 AM
I find the 85mm/1.8 lenses usually a much better deal. Background blur is very close to the 1.4 versions and sharpness much higher. In addition you save on weight (very important to me) and price. Also, while I love ultra shallow depth of field, 1.8 is already on the verge of being practically usefaul for portraits (at least outside a studio, where people tend to move).