Is diffraction an increasing worry? Or, what's wrong with more megapixels?

KenBalbari wrote:

Well larger pixels though might have an advantage in other areas, like lower noise or greater dynamic range, if we're talking about putting more pixels on the same size sensor.

But yes, more pixels will never give you less resolution. It's just that at some point, in order to get the benefits of more resolution, you are going to need sharper lenses at larger apertures (say f/2.8-f5.6 on 4/3).

We haven't reached any limits yet, though. Shooting at f/4.0, resolution would still likely benefit some from having as many as 50MP on the 4/3 sensor size.