If GT5 is in 3d then will not be the same 1080p as GT5 Prologue?

[Lafiel]

*sigh* you activate 3D mode and it goes to 720p (probably), but in normal 2D mode it will be 1280x1080 (like GT5:P) or real 1080p or whatever

PC games can run natively in many many different resolutions, why wouldn't a console game be able to run in 2 different ones, huh?