So looking around at various camera manufacturers, it seems like several are going with 16MP as a sweet spot for overall size. I also see people talking longingly about their older m4/3 or even older cameras, with less MP. Looking around, I have heard various discussions about each. Wanting to codify it in one place, so people can understand the reasons. I am going to try and leave off sensor size arguements (except as it results to pixel density, aka. 16MP m4/3 has tighter pixels than 16MP 35mm, as they have to be packed tighter to fit on the sensor). As far as I know, there are benefits to more, but unsure of the benefits of less. More MP Benefit: smoother transitions between sharp areas of contrast, due to more pixels fitting in the space, thereby able to make the jump between pixels smaller. Think the original NES Mario vs current games. You are able to crop more and still retain details, since the overall limit may still be above your threshold of detail. More MP Drawbacks: Bigger file size. It needs somewhere to put all that information. Not needed for everyone, especially since fewer people are printing (and printing large at that). I know there is something relating to noise vs MP, but unsure of the relationship. I do have a technical and engineering background, so should be able to follow any of the science out there. Please add your comments and observations, preferably backed up with the why (if you know).