Well, I just A/B'd quite a few tracks with my iPhone 6S and S7 Edge and I'm a little disappointed. The volume is the most apparent difference where when the S7 Edge is all the way up, the iPhone is right around 70-75% of the way up. This was with Dunu DN-2000J IEMs, so not exactly the hardest thing to drive. The iPhone is brighter; the treble difference is very discernible and I found this to be the same case with my Nexus 6P. I noticed a treble roll off with my Nexus and now the S7 Edge (all signs of the Snapdragon DAC?). Really though, the S7 Edge doesn't sound bad, per se, but with such a different sound signature and lesser volume it is just not as enjoyable a listen to me. Maybe those who prefer more of an emphasis on the bass will appreciate it, but I wouldn't go so far as to say the bass response is great on it.
I'm sort of the wrong person for this comparison because sound quality is like wine to me: I like what I like, but my tastes don't always correlate to a $5,000 bottle tasting better than a $50 bottle. That said, I strongly prefer listening to my 6S to the S7e and to me, the S7e took a giant step backward from the S6 and Note 5 I had. I also had the LG V10 and while I'm going by memory, was far, far superior to this.
Bummer.
-Collin-