The core idea behind Nokia's use of a crazily high resolution sensor (41 megapixels) in the 808 and, more relevantly here, the Lumia 1020, was to allow for 'computational photography'. Firstly, this involves taking large amounts of raw data and using it intelligently to produce higher quality data in smaller quantities, e.g. 5MP images with relatively low amounts of noise. Secondly, using the high native resolution to allow for zooming and re-framing without having to 'interpolate' (i.e. making up detail that's not really there). And now the same idea has been copied by Sony for the Xperia Z1. So how does the Z1 fare in a ten-scene camera shootout against Nokia's second generation PureView tech in the 1020?
Note that by 'copied', I'm not talking about anything that's lawsuit-worthy - oversampling had been done before the Nokia 808, just not in a phone camera. Sony's implementation involves a 1/2.3" 20MP sensor (c.f. 1/1.5" 41MP on the Lumia 1020), so well under half the sensor size and around half the raw resolution. The core idea's the same though - output images are at an oversampled 8MP by default, with lossless zoom up to around 1.8x
How well does Sony's version of the technology work? That's what we're here to find out, though physics usually dictates the overall result in tests of this kind and the 1020's far larger sensor meaning roughly three times more practical light gathering ability. In most light conditions, of course, the limiting factors are optics and image processing, but in low light the Z1 will struggle and it's capabilities aren't helped by the weedy LED flash being outgunned by the Xenon bulb in the Lumia 1020.
http://allaboutwindowsphone.com/features/item/18471_Nokias_PureView_copied_Lumia_1.php
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