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12.1Mpixel is way ridiculous. A standard camera with 5mp will give better image quality for a simple reason, ts not the resolution that limits the capacities, but its the lens.
By cramming more pixels onto the same size of sensor, each pixel is smaller and consequently less light hits it.
Because less light hits it, the picture will appear duller unless you increase the amplification of the signal from each pixel. But if you do that, you also increase the amount of noise, which is detrimental to the picture quality.
Even with premium components it's impossible to amplify a signal without having noise appear but there's no way that a phone is going to be fitted with premium components, so the noise will be much worse than it would be on a digital camera of the same quality, not to mention that proper digital cameras would also tend to have a physically larger sensor anyway, so they wouldn't have to crank the amplification up so much.