I'm curious about this too as the data is a bit surprising. Seems that the S7 non-edge variant would be more popular than a two year old iPhone 6, particularly in other parts of the world where android in general is more popular.
I try to make a mental note of all new phones I see out in the wild and I have seen 1 s7 non edge. Granted that's not a scientific poll, it does seem to fit with this article.
Samsung is recalling all note 7s sold and there was what, 2.5 million? That's almost a full month after release. I bet iPhone 7 passes that in a day of pre orders