I think Apple is king at the moment, however it's possible that another company will come along and change that, I just don't see it at the moment. The iPhone 7 Plus is a great phone, I upgraded from my 6 Plus and the portrait mode alone was worth it. Yes other companies have stepped up thief game in terms of design, Samsung in particular but there still no where near the iPhone in terms of reliability, quality of the OS (Samsung's Touchwiz is a big no no) and so on. Of course this is just my opinion. Apple sells hundreds of millions of iPhones and I don't see them being easily toppled. The iPhone 8 later this year will probably cement that I think, especially if the rumours are all true, but we will have to wait and see.
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The Surface is not a game changer, it's popular among a certain market but it's hardly king of the market.