As others have said, by all means get the 24-105, and get it as the kit lens for your 5DIII, whereupon the lens becomes a remarkable bargain. (And while it's nice to have faster primes and even zooms in low light, you'll be amazed at how well it performs in low light on a FF camera.)
As for the rest, what focal lengths do you find yourself preferring on your current Sony? Plus, at the risk of insulting you with the obvious, are you taking into account the difference it will make on focal length moving from your Sony, which I believe is a crop-sensor DSLR, to a FF camera? That 50mm you (think you) want will give you a focal length that looks like c. 33mm on your Sony; to get the 50 you're familiar with, you'll need 75mm. To get the equivalent of a 100mm macro on your Sony you'll need a 150mm macro; and so on. Moreover, your Sony has IS built into the camera, no? If you need IS, you'll have to look for lenses that have it.
As for starting with just two lenses, my taste may be nothing like yours, but I would get the 24-105 and, if you want shallow focus/isolation/smooth bokeh, get the 135L - it doesn't overlap with the zoom and, although it's not as fast as the 50 or 85 Ls, thanks to its greater focal length it provides comparable isolation, superlative background smoothness, and generally fantastic image quality. If, as I would, you want more reach, consider one of the 70-200 IS Ls or the 70-300 IS L (they're all great performers) or, if you want to minimize overlap, the 100-400L. At their longer ends they can provide similar portrait effects (isolation, blur etc.); you'll just have to stand farther away and make sure the background isn't too close....
