.  Do you ever shoot in low light? Do you need the resolution / do you ever print large? Do you ever shoot in situations that you need the ergonomics of the 0D? Do you even like the ergonomics of the 0D? Do you have a thing for canon glass?  If you didn't answer "yes" to any of these, why did you get a 0D?  The 0DIII is a little "behind" on sensor tech compared to your other major FF options (Sony, Nikon), the biggest thing that I notice (apart from resolution) when comparing my EM0 and my A0r, but that I don't see in your "Pro's" list is dynamic range. You can pull a lot more out of the A0r/D000's shadows, highlights and overall exposure. I'm not sure exactly how the 0D compares, but I don't think it's favorable.  Do you ever shoot in low light? Do you need the resolution / do you ever print large? Do you ever shoot in situations that you need the ergonomics of the 0D? Do you even like the ergonomics of the 0D? Do you have a thing for canon glass? If you didn't answer "yes" to any of these, why did you get a 0D? The 0DIII is a little "behind" on sensor tech compared to your other major FF options (Sony, Nikon), the biggest thing that I notice (apart from resolution) when comparing my EM0 and my A0r, but that I don't see in your "Pro's" list is dynamic range. You can pull a lot more out of the A0r/D000's shadows, highlights and overall exposure. I'm not sure exactly how the 0D compares, but I don't think it's favorable.  