I was assuming the same fixed prime lens shooting the same subject at the same distance. Of course when using an FX sensor, it would make sense to use a different lens (or magnification) and then the end result is only dependent on the number of pixels available on the sensor. The D7000 still has more pixels than the D700 or D3, but the difference is much smaller. So over-all the key question becomes how many pixels are there in the cropped image and how sharp is the photo (at the pixel level). And of course, pixel density, shutter speed, and subject motion are important factors.