I'll definitely have to think more about this. First step, maybe I should see if I can get by with the 24-70 II indoors. I do have a 430 EX flash I sometimes use with a "black foamie thing" (as recommended here: http://neilvn.com/tangents/about/black-foamie-thing/), but frankly I don't like the extra bulk of flash.
The other question is whether I can live with a max aperture of 2.8 between 24-70mm from a depth of field perspective. In Justin's review of the Sigma 35/1.4 on this site, he says "The fast aperture and shallow depth of field will capture special moments with amazing clarity while isolating distracting backgrounds." I wouldn't have that ability with the 24-70.
That said, maybe the solution is to go with the 35 & 85 right now, since those are the focal lengths I think I'll use most, and get the 135 later. The 50 & 100 might not make as much sense if I plan to get the 135 eventually.
Get the 135L first and it's the start of a long and enduring love affair. It's my favorite lens. I got both the Sigmas you mention, and the 35 is great, and the 85 will also be great, .... until you try the 1.2 Sure it is slower (the fastest is actually the 1.8, then Sigma 1.4, and then the 1.2), but there is something about the dreamy IQ of the 1.2 that keeps you wanting it badly. I saw someone suggested the 100L here. Great lens, but imo the AF is a bit too slow for action portraits.
Just my two cents.