Thank you all for the advice. The search continues. "Too many hobbies" nice chick-a-dee photos…I know they are common but I'm quite fond of them. The primary purpose is kids soccer. I have three kids that play and I typically am at 3-5 games a weekend if I'm not working.
For fun for me I would love to someday sit in my canoe with a used 7D and a cheap tele zoom and try to do some birding that way. (I just can't imagine flipping the canoe with a 6D and 300 2.
Reading through the responses:
120-300: those who have it say that it focuses fine and they like the zoom but they also seem to always state that for the same price they would have gotten the canon (unclear if these folks have the newest sigma or an earlier lens). I do have the 70-200 ii and there is a lot of overlap.
300 mk 1 everyone says that the mk 2 is better especially with the extenders…that being said I won't be using 2xextenders for my primary purpose..maybe the 1.4. The 2x would only be for secondary uses like birding.
some have suggested that the 70-200 plus 1.4 is essentially the same as the 300 2.8. I would say this…for night games and heavy overcast games I'm at ISO 6400 to 12800 with the 70-200 2.8 in order to get a shutter speed to 1/800 or better. one stop just to F4 makes that Iso 12800 to 25000 which is no good on a 6D. I can't imagine that it would work on the new 7DII
keep the advice coming. I appreciate all of it