Sony's Xperia S have 338 PPI which is even more dense than Apples "retina display". So there are other companies using high dpi displays. Galaxy Nexus is at 316

Sony's Xperia S have 338 PPI which is even more dense than Apples "retina display". So there are other companies using high dpi displays. Galaxy Nexus is at 316 PPI if I remember it correctly. HTC has a phone, Vigor, that has 342 PPI. So apple is certainly not the only company out there who likes pixels :)