as usual, the choice depends on your subjects, style, and end use of the images.
the 24-105 is my most used lens for travel and all-round - if there are lines that should be straight, i use PT Lens
i agree with others that the 70-200 f4 IS is the sharpest Canon zoom - i've tested it but don't own it, because 200mm is not long enough for me and it's not happy with the 1.4 extender
although the 100-400 is a loved and trashed lens, mine (which i believe to be a good copy) has significantly better resolution on the 5D2 than my 5D - good for prints to 17x25 (maybe more depending on subject) - and a reach that opens up possibilities not available from shorter focal length (and at 100mm it's very sharp). Coverage from 24-400 mm with 2 lenses is not bad although both are large and weighty
if your goal is large prints, then you really need primes as the zooms are not all that sharp toward the left and right edges.
the 50 f1.4 is very good at f2 and excellent at f4 plus (with wider apertures available if necessary at compromised resolution) at a reasonable price
i haven't had experience with the 85, but expect it to be as good as reported
the 100 macro is as good as reported from 2.8 to f16 (where diffraction begins, but f22 is useable) with flat field and virtually no distortion
the 135 f2 may be Canon's highest resolution lens, but i can't confirm this
the 200 f2.8 is pretty nearly as good as the 100 macro and holds up pretty well with telextenders (although the 5D2 resolution seems to suffer more than other bodies with extenders) - this is Canon's longest high quality black lens
the 300 f4 has very good resolution, but with a 1.4 telextender it's no better than the 1.4, so for me very limited in usefulness
i can't speak from experience on the wide-ange side, but hope that Canon will improve their game to offer me something worthy of the 5D2 in the 20mm range
in short, get the 5D2 and the 24-105, and if you have a question about your use, wait a bit before buying another lens.
