If you are looking for a 24mm lens with the best sharpness, the 24 2.8D ain't it. It is adequately sharp, however; just not tack sharp like the 85 1.4G, for example. [Note: Others may disagree, but I do not think that the 24 1.4G is tack sharp in the corners by any means.] What the 24 2.8D does very, very well, like many of the "D" lenses, is its beautiful color rendition. It provides more rich, vibrant colors than the G lenses, in my opinion. Contrast between the D and G lenses is fairly close as well, with a slight edge in contrast to the G lenses. So you basically trade sharpness for better color richness (rendition). Contrast is almost a push. I personally prefer shooting with the D lenses, and then just taking the time to determine which apertures they render their best IQ (i.e., maximum sharpness, et al.). With the D lenses, they are usually [at their best] somewhere between f5.6 and f11.