Yes. The 6s has been on the market longer than the galaxy s7, but the s7 has already sold more units. It's not really fair, but it's not fair in Apple's favour, and Apple still lost the current generation.
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That Kantar study is cited all over the internet. If major media outlets accept it, it must have some merit and you can't reject it just because you don't like it.
I was talking specifically s7 vs 6s, but there's a lot of info on samsung in total vs apple in total. Even if you reject the Kantar study, globally, Samsung beat Apple by 100 million phones in 2015.
The Kantar study was for a single quarter, not total. Where did you get the idea it was overall? Stating the S7 has "already sold more units" than the iPhone 6S is an outright lie.
Beat Apple by 100 million phones? So now you're going to add up sales of phones like the Galaxy Star 2 ($65 brand new) and compare them to the iPhone 6S? What's next, claiming that Lexus (S7) outsells BMW (iPhone 6S) just because Toyota has higher sales numbers?