Canon 17-55 f2.8 / Canon 24-70 f2.8 ii / Canon 27-105 f4

jayelae wrote:

I came from a 7D/17-55 combination and then went up to a 5D3/24-105 then finally sold the 24-105 and got the 24-70II.

No regrets whatsoever in going full frame AND in ending up with the 24-70II. I do not miss the extra reach of the 24-105 at all and the 24-70II is spectacular IQ wise. Since I had the 17-55 for over two years, the 24-70II does all the 17-55 does and more. Going full frame plus using a great lens for me was a quantum leap in terms of satisfaction. If you have the funds, I suggest not to wait. The enjoyment I get from my new set-up (and, I suspect, with the 6D/24-70II for you) is just on a different level.

Yes, I am am still trying to improve my technique and art of photography but even now, I no longer have this "there is still something missing" feeling, especially IQ-wise.

Agreed. OP should see the noticeable improvement in 6D with either zoom. 24-105L is still a nice walk-around zoom with extra 35mm and 'IS', and lots cheaper from combo purchase. But 24-70L II is at different level if OP can overcome 35mm shortage by getting another companion zoom such as 70-200L/4.0 IS or 70-300L, and can live without 'IS' (less critical than I thought initially).

There are other two options - Canon 24-70L/4.0 IS (better corners/edges, less distortion at 24mm, latest 4-stop 'IS') and Tamron 24-70/2.8 VC (both F2.8 and Tamron 'IS', seem very good. But heard reports of battery drain with 6D in early batches that should be fixed by now).