I currently lack a copy of the 28/3.5 (late) to make a up-to-date comparison, but between the two lenses, the "sharpness" performance of a good copy of the 28/2.8 AiS is going to be hard to beat, especially if you need to shoot at wide open or other wider stops. The non-CRC Nikon 28's (early 3.5, earlier 2.8, late 3.5) all seem to follow a pattern of acceptable sharpness in the center that noticeably drops off towards the outer zones. Stopping down helps, but does not completely eliminate the sharpness falloff. The 28/2.8 AiS maintains the apparent center sharpness much further out to the edge of the frame. Others may have a different experience.