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The 5D3 is an amazing camera, but as the OP states, it isn't really appropriate for his needs in school or event photography. I agree completely. The 1D3 is a terrific choice for that use, especially when so many images are taken per day -- 10MP RAW is a huge difference compared to 21MP RAW image sizes. The 1D3 is a huge step up in quality and usefulness compared to the 40D he's now using, and reliability should be improved as well -- the 1D3 is a tougher workhorse than the 5D3 (let alone the 40D).
I'm not saying that for...Show more →
You are 100% spot on. A typical school consists of 2 cameras shooting about 1,000 images each. The file size is a big factor in my decision and the reason why I like the 40D/1D III. More than enough resolution and quality for an 8x10 with strobe lighting at ISO 100. Love my 5D III, and would use it in an emergency, but it is massive overkill for the job I need it for when it comes to school portraits. I do use it when I need to do an all school shot which are typically printed at 16x20, that is a case where I would not feel comfortable using the 40D/1D III. I also love the 5D III for Senior Portraits and Weddings.