As I have said elsewhere, even this resolution is (or was, a year ago) impossible without pentile. It seems there's a lower limit to the size of amoled subpixels. When it was released the N9 had one of the densest amoled screens.

Even now I don't think the situation has changed very much. After the GSII not even samsung has used rgb stripe again and according to wikipedia they're the worlds bigger amoled manufacturer by a wide margin.