>>4163146On film every "pixel" is the exact color of the light that struck it. Digital is a mosaic of 3 different colors. The actual dolor data in each pixel is merely estimated, so sharp lines are rendered as blurry smears with a kind of haze around them, like a soft brush in photoshop, no matter how great your lens is. It gets far worse than just blur too, you can get false colors in the details.
In order to overcome the inherent blurriness of how most digital cameras work, you need to pile on far more megapixels than you need to just record every detail of the lens to hide the de-mosaicing blur. Only foveon sensors can overcome this by having each pixel record the color that struck it, but the sensor architecture makes them really noisy in low light.
If you combined the 3 colors on a digital sensor, you would get real film "megapixels".
