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Seems to think this is the first phone with a relatively large sensor.

Nokia 808 has a 1/1.2” 41MP sensor with real Carl Zeiss optics and Xenon flash. That’s in 2012.

Nokia 1020 has a 1/1.5” 41MP sensor with real Carl Zeiss optics, OIS, a Xenon and LED flash. That’s in 2013.

Pics from these cameras, especially the 808 (6 years old without all the nasty noise reduction, detail destroying, smoothering that goes on with most current cp) were outstanding.
 
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I disagree, yes they're small sensors, but that P20 Pro sensor is now as big as the ones found in compact cameras, and larger than 1/2" diagonal. I agree the ISP absolutely is a factor and can make up quite a bit of ground, but don't kid yourself here, the sensor size absolutely makes a difference.
If it really did make a difference, then why does Huawei still relies on a second b&w camera to help with details and low light? Why not show off how that one “large” sensor can do by just using a single camera? Look at Google Pixel 2 and what they can do with just a single sensor.

You cannot deny physics, and for phones, we are still looking at tiny sensors. Thus the ISP play a more important role. And Huawei doesn’t seem to have confidence in their setup that they decided to keep the b&w camera to help with details and low light.
 
What’s better and what suits the purposes of a smartphone shooter? To get better, one desires a full frame dSLR but then dSLR shooter might still seek that even larger sensor in a medium format. It’s endless. So coming back to smartphone shooting, iPhone’s current implantation along with its excellent processing has hit a sweet spot that satisfies most. Is the P20 better? Of course by certain criteria but not all and certainly not that noticeable for most applications (we don’t always shoot in the dark or in low light). If IQ is that important, I’d be pulling out my APC or FX cameras, or even a compact P&S. So the rest of the smartphone platform performances come to the fore and in device selection. Apple’s iPhone has the balance well adjusted for the premium buyers as demonstrated by market reality.
 

For the OP. This is just the first comparison video that popped up for me. Huawei P20 Pro vs Samsung S9+.
According to the OP this should be a blowout win for the P20 Pro because of its sensor and it is not.
 
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