Personally, I find the 458 Italia to be the most visually appealing (and perhaps) complete car to ever have come out of Ferrari. The wizards at Pininfarina really outdid themselves with the body. It just screams sexy; I wouldn't hesitate to call the 458 a beautiful car. And the wizards at Maranello really outdid themselves with the chassis and the engine. It goes fast and handles amazingly without making you aware that you're driving a racing car every second of every day.
Personally, I'd take the Italia over the F12 Berlinetta. But that's just me.