That perfectly curved fastback shape makes a hardtop vert look impossible. The break lines on the roof look fake, and yeah, you can see it's hiding a B-pillar beneath the rear window.
Past:'08 E92 335i|ZPP|ZSP|6AT|four (4) HPFPs
Present:'15 Mustang GT|401A|PP|6MT|Recaros
Sig pic unrelated. I like to go sideways and stuff.