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Fourth, in normal shooting, especially handheld, you'll rarely if ever achieve the kind of IQ/sharpness that can be obtained in a well-controlled series of tripod/LiveView tests that Roger described. You'll probably also see more variation in "real world" results for multiple shots from the same photographer with the same lens, and between many photographers all using the same lens, than are evident in Roger's test results.
Right. A lot of sharpness variation will be concealed by poor technique (raises hand), high ISO noise, etc., and when stopped down a lot of the variation will disappear as well as AF calibration differences are concealed by larger DOF. Overall I think a baseline of 700 lppm at the very worst is an extremely solidly performing lens sharpness-wise. As a point of comparison the venerable 35L is only between 500-600 lppm wide open, and I consider that lens quite good wide open. Number jockeys will have a conniption fit, but the rest of us are safe to happily continue using these lenses.