I have a similar question, but with different lenses.
I will be going for 10 days or so in the summer and the lenses I take to NYC, I would like to carry with me all day.
My arsenal at that time will be the the following:
5D mark II
17-40
24-105
24L II
70-200 F4 IS
85L II
It will be too heavy to carry around all day - and I don't think my GF will appreciate it either. I will be over there for 10 days, so the scenery will be quite diverse: high buildings in downtown Manhattan, Central Parc, people shots in suburbs, night shots, shots from Empire State Building (or Rockefeller Center), ...
I definitely want to take my 17-40 lens for the high building. I want some IS lens. So either the flexible 24-105 (that is not as sharp as the 70-200) or the very sharp 70-200 with more reach (but less flexible and draws attention to it). I don't think I would fancy carrying both ...
I also want to take (at least) one fast prime and I feel that the 24L II will be more diverse than the (rather heavy) 85L. On the other hand, the latter is great for people shots a bit further away and, well, I just feel bad leaving it at home ...
So I would leave 1 or 2 lenses at home ... Could you please help me choose which one(s)?