Photomode shot of a premium MX-5 (Miata) zoomed into the interior,
This seems to be the reason there are so few premium cars and so many ommissions (they wont model new standard cars, so if a car wasn't in GT4/PSP it will have to be made premium). They just got all OCD on doing every detail of the cars that they didn't have time to do enough... makes you wonder why they did stupid things like a WW2 VW tank/car???
On the up side with tessellation and slightly higher res textures (see above), these premium models will be more than detailed enough for next gen GT on PS4, so hopefully we won't see this standard and premium problem ever repeat itself.