It wasn't benchmarked against the 458 directly, but Ferrari in general IS competition to McLaren (just look at F1) so it seems only an obvious choice to match or surpass their performance/handling. I think they more than succeeded in this aspect. As a matter of fact, in a recent article in MotorTrend, the MP4-12c matches or beats the 458 in most handling and performance tests. It won out in a 3-way comparo in Car and Driver against the 458 Italia and the Porsche 911 GT2 RS:
In other instances though, I have seen the Ferrari lap faster and finish higher in comparison tests. Both cars really are so close in performance/handling that either one you can't really go wrong with. It comes down mainly to preference, in my honest opinion.👍