Perhaps the biggest competition to the S6 duo will come from Samsung's home country where LG G4 will take it on as the world's best. The G4 is estimated to launch in Q2 and is rumoured to bring some new features like a curved screen, a direct competitor to S6 Edge. Sony's latest flagship Xperia Z4 and the next flagship-killer Oneplus Two will also be launching soon so Samsung Galaxy flagships have a lot coming their way over the rest of the year.