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It depends on the context of course, the OP mentioned lots of BIF and sports and I took one particular context in there.
But the point is: Is it really that hard to miss focus given the correct AF settings on a 7D? It is very likely slower, but is it less accurate than the 5D3?
In one shot mode, all of the canon cameras I've owned have performed fine in non-moving targets.
All of them have done fine.