I just picked up a 85 1.8 again for dirt cheep. I had forgotten just how fast it focuses. I sold the first one because I did not use it much on my 50D and it had purple fringing that I thought was too much. Now that I have it again and on FF I can hardly believe how good it is for the cost. This one also has less purple fringing along me understanding more about how to minimize it.
So often here we all talk each other into spending piles of money on gear that (lets be honest here) many don't need and rarely will ever use. Because we think without it hoy cant take good pictures. In the 85 1.8 thread there of plenty of pictures that are killer and taken with under 1k of gear.
I picked up the 85 1.8 again because it was cheep not because I was driven with desire to have it again. That is too bad because it is an unbelievable bargain. I own the 70-200MKII as well but if you need a great, cheap portrait lens that is small and light look no further the 85 1.8 is it.