I'll tell you this much - large BMWs rarely become classics - regular E12s, not particularly valued among collectors, E28s - you'll never find them in retro film rental catalogues, E34s, were usually let to rot and are rarely being restored, E39 might be collectable in only one trim, as the rest look like overweight whale, E60 will be hated on classic scene. F10 has no classic aestethics at all. But F07. The 5 series GT. That thing is a bit blah now, but has all elements required to be timeless collectable classic