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Interesting!
I know you haven't forgotten you're viewing in 2D, and focusing on the roof/decklid flow.
While the wake cross section may be bigger at the end of the Kamm'ed car, would the Kammback shape reduce the likelihood/magnitude of the pair of drag inducing trailing vortices - more probable on a sedan/notchback?
Also, that entrained separation bubble at the base of the sedan's rear window takes fuel to feed (believe I read Phil making a comment to that effect, anyway).
There's a reason the Prius, Volt, Insight 1&2, A2, and so many others are hatchback/Kammbacks!
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