Shoot at f5.6 at 24mm, at f6.3 at 35mm, and f8 at 45mm; make sure you have enough shutter speed or using a tripod. Check the focus as well with a focusing chart. if these still results in unsharp images, then maybe you have a defective lens.
The limits of a lens is rarely its strong points (f3.5 at 18mm, f5.6 at 55mm), so you have to zoom in/out a bit and close the aperture to get best results. The kit lens is esp. weak at 55mm, and from my three copies I can attest that this is not just sample variation...
That said, a defective pentax kit lens is actually sort of rare... complaints about this lens' performance is not all that common, maybe because it's so easy to build?
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