Every car you name above is a woman's car. And if at any point you claim a Tiburon is sporty, you should be escorted off the sight IMO.
Celicas are a joke, V6 Mustangs are slow, period. You should commit and just enjoy your car for what it is and stop trying to justify your purchase to people you don't know.
My god, comparing a Mustang to a Solara.....why bother, buy the solara, it is a better car.
Hyundai sucks. And Camry's are slow. The eclipse looks like a used bar of soap and has had NO BALLS AT ALL since the AWD Turbo days.
To answer the original question: The V6 is slower than the V8, the brakes are smaller, the seats are less the supportive, the
suspension is softer, the wheels and tires are smaller etc, etc. It is less of a car at less of a price.