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I did some tripod shots and the differences were less noticeable. At 200mm there is very little difference between the two lenses in terms of corner/edge and center sharpness. At 70mm. the 2.8 lens still had a slight edge... in the center and corners-- but seriously the differences were pretty minimal and I think with handheld shooting-- and without pixel peeping... not noticeable. There is a bit more CA with the f4 lens.
I have both lenses and did a test today with the D800. All the shots I took were handheld. I shot in RAW and used CS6 for conversion. I shot at 70, 105, 200mm at f2.8, 4, 5.6, and 8. In terms of center sharpness- both were very close. I would say at 70 and 105 my 2.8 lens had a minimal advantage. At 200mm the center was quite similar perhaps a slight edge to the f4 but I was outside and the light was changing so if there was a difference it was ever so slight. The real differences...Show more →