Because megapixel count isn't the sole relevant determiner for the quality of a digital camera's photos, much like processor clock speeds can't really tell you how "fast" a processor is.
Megapixel counts, at this point, are a marketing item, and not really a measurement of the performance of a given sensor under some given lighting condition, or how you're likely to use the camera in your phone. Does the Nokia Lumia let you do some amazing things with the 40 megapixel shots it gets? Sure. But they're not high quality shots because the sensor is capturing 40 million pixels.
A high megapixel shot, in low light, that's grainy and unusable because the sensor in your camera can't handle low light conditions, is still going to be an unusable shot, regardless of the pixel count.
Apple's intention is to have the best quality images, and not the most pixels.More megapixels equates to smaller photo sites, which usually means more noise and poorer low-light performance. In just about every review by photographers, the iPhone out performs those cell-phones with higher pixel counts.
Megapixel counts, at this point, are a marketing item, and not really a measurement of the performance of a given sensor under some given lighting condition, or how you're likely to use the camera in your phone. Does the Nokia Lumia let you do some amazing things with the 40 megapixel shots it gets? Sure. But they're not high quality shots because the sensor is capturing 40 million pixels.
A high megapixel shot, in low light, that's grainy and unusable because the sensor in your camera can't handle low light conditions, is still going to be an unusable shot, regardless of the pixel count.
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