Are you considering the 100L macro so you can get IS? If not, and/or if you're good at holding a camera steady, you might as well save yourself half the price and get the non-L macro, which I hear is as good as the L version (I have the L version, though, so that's just hearsay); the 100mm f/2 costs less still. Also, as everyone else says, if IS isn't an issue, consider the 135L, which costs much the same as the 100L and is alarmingly sharp wide open (at least as sharp as the 100L in my experience - which doesn't involve test charts, though).
I realize you asked about 5.6 (I don't think the differences between the two lenses you mention will be significant there), but if you tried portraits at a wide aperture you might find yourself hooked by what you can achieve that way (and not just on people - flowers, pets, buildings etc. can all benefit) and wish the 24-105 were faster than f/4 (I seldom use my 24-105 for that reason, excellent though it otherwise is).
I realize you asked about 5.6 (I don't think the differences between the two lenses you mention will be significant there), but if you tried portraits at a wide aperture you might find yourself hooked by what you can achieve that way (and not just on people - flowers, pets, buildings etc. can all benefit) and wish the 24-105 were faster than f/4 (I seldom use my 24-105 for that reason, excellent though it otherwise is).
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