Well, i don't have 5D3, but i have 1DX, now i use 1DX for almost everything, but once i start to use this A7R then i will keep my 1DX for sports and actions, so 100% A7R for landscapes and architecture, 100% 1DX for sports and action, or say 50% A7R and 50% 1DX as long i shoot landscape as amount of shooting sports or action somehow.




