« on: February 01, 2014, 11:35:41 AM »
I was shooting with a 5D3 and a 7D as a second body. I often shoot with two bodies. Recently, I replaced the 7D with another 5D3. Note that I still have a 60D. The feature "benefits" of the 7D and 60D -- high FPS, extra reach, articulating screen --paled when compared with the benifits of full frame. And, I reaaly liked the articulating screen. My 5D3 is sharper, has more color latitude, is better in low light, and yields smaller DOF. But, you know this.
The 5D3 is a step up from the 6D for action. For me, this was a must. If you don't find the 6D focus system to be limiting for what you shoot, then get another 6D. Down the road, I think you would find the 70D to be a dissapointment becuase it still is a step down in IQ. Plus, when switching bodies, it is nice that both have identical controls.
Also, keep the 24-105 for your wife. If you were to go with the 70D and you wife wants a good zoom, then you afe looking at the 17-55 f2.8 which is a GREAT crop body lens. But, the 6D/24-105 is a sharper and more versatile kit than the 70D/17-55.
I'm using the 7D and the 60D as "training tools" to help my wife and kids get more comfortable shooting in manual or AV and with back-button focussing. Also, using them to encourage more selective use of ISO. This way, they will be more comfortable shooting with one of my 5D3s if I need their help or if they want more out of their shots. My bet is that the 6D will be just as easy to learn the craft as the 70D is. The only caveat is whether video is a high need. Then the 70D might be more attractive.