Let me try to bring some sanity to this Kirivon/newspaper bashing fest:
A DA* lens, at around 2m, even if it's at the end of its zoom range, should be able to show consistent across-the-frame sharpness
at f/8.
Period. You don't pay $750 for a lens that's decentered (Kirivon mentioned that no amount of trying could bring that left side into focus, which rules out field curvature).
Please stop saying you don't take pictures of newspapers. Neither do I in my everyday photography, but what if Kirivon uses his lens to take a shot of his family lined up in front of their house? Whoever is standing on the left side of the frame is going to be blurry. Hopefully, it'll be the weird aunt that nobody likes, but what if it's Kirivon's dear grandmother?
The point is, if the lens is decentered, it can affect the quality of pictures taken in the real world. It might not affect
every picture, but does anybody want a lens that you have to keep reminding yourself not to use in certain situations because it's faulty? I certainly don't, and least of all if I paid $750 for it. It's one thing to understand what the inherent shortcomings of a lens are when they are due to the nature of its design (not sharpest wide open, not sharpest at closest focusing distance, etc.) and avoid them. It's quite another thing to put up with a construction fault or defect.
Kirivon, if this were my lens, I wouldn't return it, I would send it to Pentax to have them fix it under warranty. Call them up and ask them what you need to do (they'll tell you to include photos showing the problem and a full description).
Shooting newspapers, brick walls or what have you is an integral part of testing a new lens. If you guys don't want to do it and ignore a possibly faulty lens, that's up to you, but please don't tell someone with a faulty lens to shut up and go shoot.
Would you tell someone in a car forum who reports his new car doesn't brake properly to shut up and go drive?
'Nuff said.