Of course- the smaller the aperture, the sharper the image, up to a certain point. Obviously, this depends on the lens itself, but you can use F8 as a rule of thumb for the sharpest aperture. Really small apertures, such as F22, 32, and 45, can start causing distortion. Lenses that are almost as sharp wide-open as they would be around F8 or 6.7 are considered as "great lenses", and typically that's what you can expect of FA*'s and Limiteds.
Let's take my A 15mm F3.5 as an example. If I shot my bookshelf at F3.5, most of the titles would be blurred and show a slight fringe. At F8, however, all that would be gone, and we'd have crisp letters!
Adam
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