What do you think of the Infiniti G35 compared to a Porsche Carrera or BMW M3?

my dad has looked at all of those cars and ended up with a 2005 carrera S. the carrera can do 0-60 in 3.9 seconds, therefore it is a lot faster than both the m3 and the g35. one thing about the porsche is that its not really comfortable at all compared to both the infiniti and the bmw. i myself have a bmw and the ride in my car is much smoother than the ride in the porsche. at the same time, the porsche is much more expensive than either the g35 or the m3.