Porker:
I agree the P1 has too many similarities with the 12C, I don't agree though that the P1 seems to be the slower of the two. Judging on the journo's reactions after their respective drives, it seems they were more awestruck by the P1 than the LaFerrari, imo.
What does seem clear is, the 918 doesn't get mentioned too much when comparing both, it seems to be in a league of its own, be it good or bad.
On the other hand, I do feel both the P1 and LaFerrari are horrid designs, while the 918 is gracious and balanced in its design. As to which one I'd like to own, I really can't make my mind up, they all strike a different chord...
When Porsche announced the 918, there was no target, they were the only one saying they are doing another halo car. Their initial performance target was quite 'low'. They were also targeting a different league, going for a everyday hyper car rather than a all out monster.
McLaren and Ferrari on the other have the 918 as their target. They know what will be coming from Porsche and do their own thing.
Ferrari is expert at hyper car game, so i's quite easy for them. McLaren on the other hand can still be consider a new comer despite the F1, they are also constrained by money, so they had no choice but to build on the 12C platform. But since these 2 are F1 rivals, their focus is more on all out track performance. The resulting cars shows.
But consider the whole performance envelope, from all out top speed, cornering, engine output, track performance, road performance, engine efficiency, fuel efficiency, battery performance, which of the 3 takes the crown? Arguably the 918. It has the complete package and it's deficiency isn't that far off the other 2 yet it blows them away on it's strengths.
--