In his editor's comment on the Two Things You Can't do on the Internet, Micheal alluded to a technical discussion of horsepower vs torque. Bewildered by the technical discussion, he stated that he would just get in his car and drive away, apparently ignoring the specifications. The following analogy demonstrates that, depending on the intended use, specs do matter.
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The horsepower ratings are similar, but if you want to push around some dirt, you would likely choose the Caterpillar. If you wanted to go down the highway in comfort and speed, you would likely choose the Porsche. If you needed a better value for transport, you might choose a Ford Focus. The same considerations apply to cameras. If you need resolution and the highest image quality, you would likely choose a P65+. If you need portability, a wider choice of lenses, and a good cost:performance you might choose the D3x.