I've just moved to full frame with a 5D3 and do a lot of sports, albeit mostly indoors lately, and would like to do more wildlife. I've shot with a 1.3 crop body for years, so need to get something for the long end. I gave up my beloved 400 f/2.8 last year, and had been making do with the 200L + TCs. But, with the full frame, I need to do something different there. I'm a big all over the map.
- I'm liking the 100-400, but its getting long in the tooth and not crazy about the form factor.
- I have thought about giving up the 200L f/1.8 and getting a 300L f/2.8 IS... because with TCs it will go a little longer than the 200, and naked it will be the right focal length indoors for what the 200 had been doing for me.
- I've thought about the 70-300 non-L as a supplemental to throw in the bag for family outings, but also thought about the Tamron 28-300 for the same reason (and I know its not L quality glass).
And I've debated about every other possible option in the 300-400 range...
I think I need to just not do anything and see if anything floats to the top, but I have a hard time doing that. 


