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No doubt Sony is expensive and the used market isn't as robust. But it's getting bigger as more older Sony bodies and lenses are showing up on FM.. POTN...etc. But this is no different than there really aren't that many used 1DXII, 200-400mm.. 400mm F2.8II on the market.
For Nikon, there are tons of 200-400s on the market and with Canon and Nikon, you can get previous model lenses, which is great. The newer ones pop up enough on SportsShooter that anyone that wanted one would have no problem getting it.
For Sony, you can't even get a 400 2.8, so that kind of eliminates that.
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But I love what Sony is doing...and I would love to see how Canikon will respond.
I think your main problem is that CaNikon don't want to give up their lens mount and have THREE lens mounts (Crop, FF and Mirrorless.) They want something that focuses quick that uses their current lenses. That's a physics problem.
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With silent 20fps, blackout free viewfinder, and 1/32,000 shutter speed with better follow focus than 1DXII (if true), then you got a serious contender.
1/32000 doesn't do anything for me. If i am shooting in direct sun, iso50, 1/8000th 1.4 is fine if I need to be wide open.
Canon is not who I would benchmark my follow focus on, just saying. I didn't have the 1DX2 obviously, but I could show you some embarrassing examples from the 1D2, 1D3, 1D4, 1DX and 5D3. Canon's a little better at snapping to focus (depending on lens) but generally not as good as retaining it on a moving object.
If I wanted 20fps, I would go to Video. Cinema standard is 24fps. Even on the top end cameras that do 11-16fps, I generally move them back to 10fps. Only real benefit would be with trying to get a bat on the ball in baseball. An extra frame or two could be nice there. But the more FPS you have there, the more your follow focus is going to suffer.