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As one who has shot a lot of soccer, I agree with skibum's analysis. Sometimes timing a single shot is the way to go, and certainly Dan is right that we often waste bursts of high fps (and even miss the critical moment by machine gunning around it), but 10 fps is really nice to have for many purposes.
When it comes to something like a 5DII replacement, though, I can't help feeling that the main strength of the camera is IQ and portability (compared to 1D), so while there'd be nothing wrong with high fps if it can be incorporated without compromising size and weight (let alone short changing AF performance or anything IQ related), it wouldn't be a priority for me. Just me.
I think you underestimate how many people shoot sports. And there is a very big difference between 5 and 7.5fps, even between 5fps and 6.3fps. When shooting sports, it just so happens that at 4 fps you virtually never get two ideal key frames of action from any specific action sequence for many sports, at 5fps you might but it's only very rarely, at 6.3fps many times you still only get one key from but all the same you can get two key frames many times too so the extra fps suddenly means a lot know since you can get...Show more →