I have a D90. I use the Sigma 50/1.4 a lot for candid people photography (my sons). The Sigma is a beautiful lens for bokeh but it is just a little too short for head/shoulder shots. I have the 85/1.8 but found its bokeh a bit harsh at times. With the new 85/1.4 AFS lens out, I have seen many old 85/1.4 on the used market. The alternative is the old 35-70/2.8 which can be easily found for $3-400. In terms of bokeh, which one do you think is better? Is it substantially better than the 85/1.8 that I already have or the new 85/3.5 VR, both of which are much lighter? How about flare control? Thank you for the help.