Oh, you mean the company that is trying to sell you a $600 (for a limited time!) add-on to your iPhone that they claim allows you to take better pictures? that's the first thing that popped up when I went to your link (see attached image).
Beware reviews from any entities with a direct financial stake in the issue.
If that were the case, the dxo-one would perpetually be at the top of the list.
I have to actually agree with the review. The Samsung Galaxy S6 DOES take MUCH better photos than the iPhone in 90% of most conditions. That also spread to the iPhone 6s / 6s Plus. What Apple does have going for it (in some cases) is it's speed of use and ability to get rather good photos in proper lighting. Once the lighting is gone, then there's issues with the photos. This is also evident with the 6s Plus. The images between the 6 Plus / 6s Plus are practically the same unfortunately in the majority of conditions
There's a yellow haze in shots, macro mode has issues with focus, color bleeding depending on the subjects, lots of artifacting and so on and so on (this is with live photo mode DISABLED).
Apple performs extremely well in daylight shots and landscapes. Probably some of the best photos you can take. However, many photos aren't taken under those conditions. Where Apple fails is in low light. Once there is lower light, the quality decreases and almost exponentially. Even with all of these issues, the exposure and leveling is surprisingly good.
If there is any caveat to Apple is that it does NOT follow the industry and provide PRO camera features within the simple camera app. Many of the top 5 camera phones can take raw, provide PRO mode, and have a level of flexibility that Apple doesn't have and therefore makes a much better experience than Apple has.
The results, in my opinion, do not surprise me. But the issues are prevalent with the phone. In fact, this Apple version has made me give up on mobile photography and Android has made me a much better photographer. And in Android Marshmallow, the camera apis have improved almost across the board. Sufficed to say, Apple is no longer king.
Sony surely is in many areas. The z5 is fantastic. If the OS wasn't slow...