Okay. Next up, f/8. I should have tested this with VR off as well, to see whether VR was impacting sharpness with the sharper aperture, but I'm afraid I was too lazy - and I didn't want to start bringing high ISO into the equation. This is f/8, 1/250s, ISO 280 with VR on. I think it has the edge over f/5.6; I didn't check all intermediate apertures, but I'd generally stop down a tiny bit with this lens if I could.