I just took the plunge and got a 5D MKIII, and I am thinking about picking up some new glass but can't decide between the two listed in the title.
As of now I am planning on keeping my 7D, so I would be keeping my EF-S 17-55mm f/2.8 IS, but who knows what the future will bring (I may sell it). If so I won't have a 2.8 "walk around" but will still have my Canon 24-105mm f/4.0 L IS (my copy is very sharp also).
I could use a nice prime, and the 85MM would fit the bill very nicely, but I also like the 100MM Macro L lens for portraits, it does an amazing job for what it is (but it's not as fast, of course, and won't give me the results of the 85).
Without getting into too much more, I'm curious to hear your feedback on which I should get next based on my current gear?

