every iOS device since day one and the 544 on the Exynos 5 Octa is similar to the 543 used on the A5 and A5X with some changes. Currently, Apple uses the PowerVR SGX 543 MP3 with its A6 used on the Apple iPhone 5. And as if Samsung and Apple needed to continue to butter each others' bread, Apple owns 10% of Imagination Technologies, the company behind PowerVR. Which means that Samsung had to believe that the difference in performance was worth doing business with a company used and partially owned by (even if it just 10%) its number one rival.
While the Samsung Galaxy S IV is still a few months away with May now the frontrunner to be the month of launch, it could very well include the Samsung Exynos Octa under the hood. If so, that would mean it would be the first Samsung flagship Android model since the OG Samsung Galaxy S to use PowerVR to handle the heavy graphics lifting.
source: AnandTech via AndroidAuthority