Lets discuss the possible performance differences between the different sized models. Both run A8 chip, same operational frequency. One is pushing 326ppi (750x1334) vs the other pushing 401ppi (1080p). Clearly the iPhone 6 Plus running the same processor will be slower than the smaller sized iPhone 6. This is because it pushes 23% more pixels through the same processor. What does this mean for GPU performance? Well for one we can assume that developers will be programming for the larger 1080p display. This is common sense since it is the lower performing of the two. This also means that we could potentially never see apps take full advantage of the iPhone 6 GPU performance. How do you think performance will scale at different resolutions?