1) sensors that small are very noise prone. 2) 2 megapixels doesn't translate to a significant difference in the size of the final image -- remember it's an are

1) sensors that small are very noise prone. 2) 2 megapixels doesn't translate to a significant difference in the size of the final image -- remember it's an area, therefore to double the size of the image, you need 4x the megapixels -- so this probably only amounts to a difference of a couple of hundred pixels in each dimension, not enough to make a significant difference in how much cropping you can do 3) larger photosites lead to lower noise So odds are the lower resolution sensor will lead to better image quality at any chosen ISO, even if every other factor remains unchanged, including the quality of the lens. While it's true that a good lens matters more than a few megapixels, it's also true that cameras with tiny sensors don't make images that print well due to noise.