To be fair Kudryavchik, you are a little big harsh to Ferrari, they have closed the gap in recent years (I agree that a 550 for example is of poor quality compared to Porsche, even the 612 really).
But the 458 is actually a very good car with a very "healthy" chassis, unlike the frankly awful 430. The 12C may have a carbon tub structure, but it would seem its chassis not as good. Personally I have not driven the Macca but I drove a 458 at the 24h of Spa and the 12C were terrible, unreliable, awful gearbox, hard to drive. The Ferrari on the other hand was pretty much perfect and vert reliable.
So it should be, it's been around for some time now but I am a firm believer than racing improves the breed.
You can tell RealZeus is a true diehard Tifosi but it seems from his posts he has close to zero time of driving behind the wheels of the car mentioned in this thread. To say that a GT3 is under engineered compared to a 458 is very ignorant and one just needs to drive both to see the light.
As for aero is concerned, for road cars, it's very simple, unless you have big front splitters and big rear wing, it's pretty much marketing BS.
I can feel the aero when I'm driving the 458 GT3 and that's thanks to its rear wing period. A Challenge car relies a lot more on the tyre grip and the road car, even more.
Road cars in general rely a lot more on tyre grip than aero grip. Plus too much aero hampers top speed and these big supercars want to claim at least 330 kmh.
Couple of pics from last weekend. I love the side LED from all AF Corse's cars, looks cool.