It is only recently that Samsung phone camera have been marginally better than iPhones, it took Samsung seven models to achieve camera parity, that's hardly an achievement, but an achievement regardless. And I think we have reached a point of diminishing returns, there is only so much that can be done in terms of camera sensor size in phones to improve noise and DR. Manufacturers are exploring the design space for improvements by different means, such as dual cameras.
And why compare just the camera, why not also show the lagging part of Samsung S7, the processor, care to compare that to the processor of 6s and now the 7, in-spite of using lesser cores and clocked slower?