When we got some tips last year that Huawei will be unveiling a flagship P-series phone with a 40MP camera and 3x telephoto zoom, we found it hard to believe at first but the company delivered. 

This year, high-res cameras with pixel-merging technology can be found even on midrange handsets thanks to Sony's 48MP sensor. The exposure-binning night shot option is becoming ubiquitous, too, but the P20 Pro still holds the record-setting 3x "optical" zoom title. It will soon be snatched by the P30 Pro and its periscope zoom system that will eventually allow the breathtaking 8x ...