Eh, maybe it's just me but the Sport Classic feels entirely cynical - it's not quite a sticker pack for the Turbo, but it's darn close to high-class version of that. No enthusiast I know would take one over a GT3 Touring.
I could stand corrected but over the long run a mint 5BW might be more collectible because it's more
honest, even if it's not as rare. The 4BW and 5BW seem like they were designed to be a love letter to people who love the V formula, an enthusiast product to the core. That, plus if Cadillac keeps getting podiums at LeMans who knows?
The only problem is I can't stop driving mine so I guess collectability is moot