They're still PS2 assets, which is what we're talking about carrying over. Nobody said they carried over in-game PS2 models, they copied over the best version they had but they're not anywhere where near PS3 quality. If you think they are you're either blind or in denial. Yes, the premium PS3 models are lower in game than in photomode but they're still way ahead of the PS2 models which, once again, are just copied and pasted from PS2. I could do this all day, but I don't care to since you're so stubborn.
There are no standard cars in GT5 or GT6 that are the same quality as premium cars in game, not even the RUFs or other upgraded models. They're still below that quality, if they weren't they would be premium models.