Mark Palmquist , Mar 04, 2013; 03:32 p.m.
I own a 1Dx but I have not shot with the 5D III yet outside testing in store. Canon is lending me one on 3/13 via CPS so I can do a thourough use test. While I love the 1Dx sometimes I want a lighter body when I don't need to shoot high FPS or require absolute weather sealing so I am considering adding a 5D III. Right now I shoot 1Dx with a 1D IV as backup so a lightweight body would be good for me.
The question of the price being worth it for the 1Dx vs 5DIII comes down to these points to me, weighted for price difference:
1> FPS, if you shoot any action, sports or wildlife 1Dx> 5DIII
2> Weather Sealing, the 5D is weather sealed ( I but not to the same level as the 1dx) 5DIII >= 1DX (if you are going to be out in torrential rain or at the foot of waterfalls I would go 1Dx, a light shower 5D should be fine)
3> IQ, 5DIII > 1DX (cost to 5DIII, thought the IQ on the 1Dx is basically the same to my eye)
4> build quality, 1DX >= 5DIII (but do you need a armored truck or will a f-150 do you okay)
5> AF, 1Dx > 5dIII the AF speed/accuracy on the 1Dx is second to none in my opinon (this may change with more testing on the 5DIII, if it's close the cost difference may tip it to 5DIII)
6> low light, 5DIII=1DX the 1dx has a slight edge in low light AF the 5D a slight edge in low light IQ (from what I read)