The bokeh(out of focus background)of the 20 is much more correct( what a DSLR would do).Ok... I've taken some photos to help try and make my point. All S7 photos are on the left. Both phones kept on standard 'out of the box' settings (so S7 are slightly larger at 12mp compared the P20 Pro's 10mp). Also forgive me for the rather unimaginative photos!!
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I 'think' I prefer the bright red on the coke can and the slightly warmer feel about the lamp in the background on the S7 photo.