Takingshots said:
Say that I have a bunch of Canon expensive lenses, and between now and then 2016, what if Sony develops a newer FF camera like the rumor A7r II ( higher ISO, quieter,speedier autofocus plus 5-axis stabilization) and MetabXXX comes up with improved faster focusing electronic adapter for Canon lenses, would you consider these options (hypothetically)? Bear in mind anything could happen between now and then .... in specifications etc ....coz' it is only a rumor.
My personal plan is to get the A7r II or A9 for my landscape photography, along with a metabones. I want to be able to use Canon's manual TS lenses for landscapes, and the MP-E 65mm zoom macro which is also manual, so the AF performance with the metabones is a non-issue for me. I'll probably get some Zeiss lenses for the E mount as well over the long run if I decide to keep Sony for my landscape photography.
I'll be selling most of my wide angle Canon lenses, including the 16-35mm, 50mm, and maybe the macro lens (depends, I do like that lens, but I may not need it if I decide to go with Sony for macro as well), and my 100-400mm. That should give me more than enough money to fund my other goals.
Those goals include getting a Sony A6000 (or possibly it's replacement) or a Samsung NX1 for a more every-day round about action camera. Both have amazing frame rates. The benefit of the A6000 is it is also e-mount, and would be compatible with the A7 series FE lenses.
Finally, I plan to get the Canon 5D IV to replace my 5D III whenever it is released, to be paired with my 600mm f/4 for my serious bird and wildlife photography.
Basically, the plan is to keep the 5D series and Canon telephoto primes for my primary action, but move to Sony for more every-day action (it's just impractical and risky to haul around the 5D III and huge, ludicrously expensive 600mm f/4 lens every day) and for landscapes. I don't like the IQ of the 5D III for landscapes. I don't much even like the IQ of the 5Ds for landscapes (although I am really impressed with the IQ of the 5Ds for portraiture...as good as the D800.) As the A7 or A9 series bodies would be used on a tripod, remotely triggered, AF performance is not an issue. Ergonomics aren't really an issue. Lens adaptability may be an issue...it would be very nice to be able to pick and choose any lens I want out of just about any lens made in the last 100 years.

I could even grab the wonderful Nikon 14-24mm. The Zeiss lenses for Sony E-mount are pretty nice, and a lot are coming out to fill in the gaps in Sony's E-mount lens lineup. Plus, the IQ from the Exmor sensor is amazing, perfect for landscapes.
The A7r (and probably the Mark II) are quite cost effective as well, and the A6000 is in the same price ballpark as a Rebel with significantly more features, significantly higher frame rate, and E-mount cross compatibility with the A7 series.
Anyway, that's my personal plan...not sure if that gives you any ideas or helps or not, but I hope it will.