24-105 F4 vs 70-200F4L (non is)

So I'm making the jump to FF 6D next week... (had 60D w/ sigma 17-50 2.8, & canon 85 1.8) now I'm trying to debate if I should get the 6D with 24-105 or 70-200 F4 (non is). I do mostly outdoor portraits and studio work so I'm curious which would best for my shooting style.
 
Hi fair tomorrow!

You didn't tell us, if and which parts of your kit you're going to keep and what's sold to fund the step to FF (congrats on that ;) )

I hope that you'll be keeping the 85/1.8 because it's a great value portrait lens on FF (although with some CA).

The Sigma is presumably the Sigma 17-50mm F2,8 EX DC OS HSM and the DC means for APS-C.

So with this lens you will lose all the focal lengh for WA, standard and Portrait range. (as mentioned by candyman).

So I am also fully for the 24-105L because it is a brilliant allrounder with some small weaknesses at the wide end. And you should get it relatively cheap as kit lens or white box. Keep the 85/1.8 for shallow DOF, studio portrait, and low light. This will be a good allround setup with just some tele missing.

Save money for tele. Get the 70-200/4.0 with IS later or some other lens according to your preferences.
The IS version is more expensive but in addition to IS it also delivers better IQ as you can see at TDP:
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=104&Camera=736&Sample=0&FLI=0&API=0&LensComp=404&CameraComp=0&FLIComp=0&APIComp=0
 
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