Nobody disputes that Sony can't possibly do 4K resolution for PS4

[Dgc1808]

PS2 supported 1080p. Only 1 game used it but supported it and wasn't launched at 599.
PS3 supports 1080p. It's used for movies via bluray and 1080p video content from the store or placed on a storage device or even the systems HDD as well. It's used mostly in PSN games and games that aren't too hard to render. Most notable exceptions would be WipEout and Gran Turismo 5. The bulk of PS3 games simply run 720p native.

PS4 with 4K will likely be the same as 1080p on PS3. Used FOR MOVIES and for games with simpler art-styles like Disgaea and SoundShapes.