Samsung recognized a number of important areas where its 2014 flagship cameraphones didn't cut it. We're pleased with how the company has handled launching the camera - S Voice often goes unused and taking over its shortcut was a great idea, while optimizing the camera startup time was an even better one.
With the improved capabilities of both the camera and the chipset, adding a manual controls mode is welcome too. HTC already has one even if it didn't have a camera to make proper use of it, the Lumia Camera on Windows Phone has been peddling manual controls as a key feature for a few years now.
And the camera's capabilities have indeed improved since the Galaxy Note 4/Edge. The new one gets more light and a shallower depth of field from the wider aperture and the processing has improved. Photos have less noise and foliage among other things looks much better. The soft bokeh that's possible now is highly impressive.
Video recording shows incremental improvement though we haven't tested all video modes, to see if those all-important high framerate modes have gotten better.
The Samsung Galaxy S6 edge (and its flat-screened twin) has a solid claim for the title of best mobile camera. It's certainly one of the friendliest with refined image processing and features to suit both casual users and enthusiast photographers.