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The corners and metal frame of the A3 and A5 (2016) are just a bit less round. This might seem like only a very subtle difference, but the result is that the phones look thinner than the S6, even though they are not. Another small but significant difference is the glass. The 2.5D Gorilla Glass is a lot more 2.5D than in the S6, ensuring the display looks like it’s floating on top of the device.