A better comparison would have been an F10 M Sport vs an F30 M Sport which look much better.
Originally, I was going to buy an F10 because of the size but I just hated all of the colors it comes in. If it had come in Montego Blue, Hellrot Red, Laguna Seca Blue, Sienna Red, Estoril Blue, Interlagos Blue or some other interesting color I would have bought the F10.
Instead, I ordered the F30 in EB2 and the sizes are quite comparible, especially the rear seat room. The cars have the same engines and the F30 is lighter and the color was why I am buying the F30.
When the F10 comes in a better color, I will buy it but for now I will enjoy the F30.