"0 - 60 mph in 5.3s... sure..."
Well, lets make things clear:
Compact sedan: no - A3 Sedan - CLA (C117);
Compact coupe: 2er (F22) - no - no;
Mid sedan: 3er (F30) - A4 Sedan - C (W205);
Mid coupe: 4er (F32) - A5 Coupe - upcoming C;
Mid 4-door coupe: upcoming 4er GC - A5 Sportback - no;
Large sedan: 5-series (F10) - A6 Sedan - E (W212);
Large coupe: 6-series (F13) - no - CL (C216) ;
Large 4-door coupe: 6-series GC (F07) - A7 Sportback - CLS (C218);
Luxury sedan: 7-series (F ) - A8 - S (W222).
And I think it was a right decision making the separate named mid-size coupe - 4-series. However, I think the Gran Coupe trend is unneeded (it is just a good way to ask more money from customers for no function at all). And 3er and 5er GT are just have to be vanished out of Earth's face.