panopticon,
Welcome to the forum. I have a 5D mkI and a 24-105. I shoot portraits with it at 105 quite a bit. At f4.5 it is sharp and had good bokeh. I would like more but it is nice.

- Canon 16-35mm f/2.8 mk2 - decent low-light capabilities and covers a wide span of focal lengths - not quite the same play with DOF as the below contestants though. I have not used this one. I have the 17- 40 f4.0. It is nice when I need the 17 but I do not use this lens much.

- Canon 24mm f/1.4 II - good low-light capabilities, but can 24mm double for landscape and street photography? Compared to the 35mm, this one has weathersealing from what I can tell. I think the 24 here is a good choice.
- Canon 35mm f/1.4 - again, good low-light capabilities, but can 35mm double for street photography and landscapes? Not quite wide enough for me.

- Canon 100mm f/2.8 Macro IS - good bokeh, decent low-light, IS, and has macro-capabilities, but supposedly a slowish AF. I have thought about this myself but I love the 135.

- Canon 135mm f/2.0 - excellent bokeh, good low-light, and with an extender it can double as a proper tele-lens! I'm quite hooked on its bokeh... I played with one of thes on my 5D. I loved it. It is on my list. I was surprised at how heavy it was. Felt much heavier than my 24-105.

- Canon 24-105 f/4.0 IS - the swiss-knife spanning from 24mm landscapes to 105mm portraits, but never really shining at either function. Great walk around lens

- Canon 70-200 f/4.0 IS - lightweight, good sharpness, but only f/4.0 - perhaps a 135mm with an extender would work just as well. No IS on the 135 could be an issue. I have the Tamron 70-300 VC(IS). It is black so it is less conspicuous than the white canon lenses. It is sharp to 200, a bit soft to 300 but acceptable. I use it in street photography and find the IS is a must but it works great. I get quite a few shots of people without them knowing it. Here is an example of a street shot with my Tamron @300 usint my 1DmkIIn

IMG_0387 by clemmb60, on Flickr

With a FF I also feel you also need a 50mm.
Here is my suggestion:
5DmkII
24L
50f1.4
135L f2.0
Tamron 70-300VC