« on: October 21, 2014, 10:27:43 AM »
People can make all kind of "own" definitions.
I tend to follow Canon definition and they reserve "Professional" to the 1D-series. So the cut off for Canon is that 5D/5DII/5DIII did/do not qualify.
Sorry, but that is simply not true. Canon does classify the 5D3 as a professional camera, as least in Europe. Take a look at these Canon websites:
Oddly, the 5D3 is categorized as 'Enthusiast' on the canon.com.au website, and the Canon USA and CN websites don't make that distinction in their website layout.