Jpeg quality on export

I am experiencing a problem with the quality of the jpegs I get when exporting from Aperture. What I want to do is export adjusted NEF files to jpeg at the highest quality but at a reduced size to fit within 950x950. I have a preset arranged and the exported file is at the correct size. The resulting file however is not as sharp as I would expect and often has indistinct but readily visible flaws (almost as though the pixels have not been perfectly put together).
The same file exported from a trial version of Lightroom 2 are pixel perfect and visibly sharper. I have been viewing both exported jpeg files in Preview. I really like Aperture and use it a great deal. I do however need to sort this problem out asap.
I would be very grateful if you have any ideas on how to resolve the matter.
Thanks.
Simon.

Thanks very much for your input Ian. Here are a couple of examples. Small differences to be sure (although I have seen worse than this), but visible nontheless. I would look particularly at the rendering of the sea near the rocks on the left of the picture
Aperture:
http://swjones.onexposure.net/photos/6098/aperture-version/
Lightroom:
http://swjones.onexposure.net/photos/6099/lightroom-version/
Both images had the same export presets.
Thanks again, any help gratefully received.
Simon.

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