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More sophistiated sensor? It's a fraction of the GR sensor, and smears detail like a motherfucker. The photo I posted for the last challenge I couldn't have taken with an iPhone for shit. Yes, the cameras in phones are getting better, and yes, a photo taken on a phone is just as valid. But this whole 'small cameras are dead' thing I don't buy. Sure, for some people a phone is all they need. But there's still a difference.
Usually because it doesn't have the capabilities to go a high ISO and a faster lens for the scenario, oh and a larger sensor to allow more light in.