The OP's post was, as he said, just about resolution. And that's why I answered the way I did. Notice my reply started, "All other considerations...aside."
Essentially, most of the replies seemed to be saying the same thing--the resolution of an image is a function of the total pixels forming the image, and the density of the sensor being used is irrelevant, *all other considerations aside.* So, no, a D300 is not a higher resolution camera than the D600, even though the D300 has greater density. That's what the OP was wondering about. Image quality, lens size, kit considerations, ISO, are all irrelevant to the OP's question.
And, yes, of course, the choice for maximum detail on a landscape scene would be the D600 over the D7000. My question was rhetorical because I figured I had made the point.