Those flagships are sold to photographers but in reality only vanity Instagrammers will be really happy with the results
No professional photographer at anything above the level of "i've got a DSLR and I could take photos at your wedding, therefore i'm a professional wedding photographer" will be using a smartphone in any case.
Both of the professional photographers that I have met at events carry several different DSLR's, plus a carryall of expensive additional extras such as lenses, stands, remote trigger flashes, filters and things that I don't recognise despite quite a good knowledge of photography which had the look of costing considerably more than a new car.
"it's as good as a DSLR!" though is probably good marketing for the people who only take photos for facebook and instagram though...