Today, I have a Canon system that I've built up from 2006 to now. I have four kids, and I shoot our extensive canoe / kayak trips around the Great Lakes, and I shoot a lot of sports. I also shoot a lot of other normal family stuff. My eldest two kids are both 3-sport varsity athletes, but one is now in college the the second is a junior. The younger two kids are simply not the same kind of athletes. More band, theater, etc.
What I have: 5D3, 24-70 II, 24-105, 70-200/2.8 IS II, 100-400 II, 24L II, 50L, 85L II, Sigma 120-300/2.8 Sport. Also three flashes and triggers.
I'm looking to add a Sony A7rIII, 28/2, and 55/1.8. I'm also thinking about adding the 21mm convertor for the 28mm lens. What appeals to me here is a super high performance, but smaller, kit set up for 21-28-55 focal lengths, plus the ability to use my EOS lenses. I look at the performance vs. size of that kit, and it appeals to me.
For sports, while it lasts, I'll keep shooting the 5D3. After that, I might move to Sony native long glass. The Sony 100-400 would probably cover my needs, I won't need a 70-200/2.8 anymore.
So in the near term I'd look like this:
5D3 + A7rIII
Canon 85L II
Canon 24-70 II
Canon 100-400L II
I know the opinions on the Sigma and Metabones adaptors go back and forth. The Sigma is $150 less. Opinions?
Anyone try a Sigma 120-300 with an A7RIII?
My plans for flash work are kind of up in the air, but for now I think I'll just use the Canon.