To me the Lapierre is a really nice bike, amazing spec and looks great.
The Pinarello however is a true super bike, a Ferrari of our beloved cycling. But i'm not mad keen on those hoops.....
I took the plunge on a new Pinarello K10 last summer, it's no F12 but i love it and love riding it. There's something special to me at least about being able to ride such a bike, the feel of getting it ready for a sortie, whizzing down a nice decent and just taking advantage of it's aero benefits. I often get compliments on it if i ride with people, usually "look at that FB struggling to get up that hill on his nice bike" or similar words, it has caused me to aim to improve my cycling so i can live up to the brands credentials.
I was lucky enough to fit a small sized frame in an odd colour that had been hanging around the shop for 18 months so some how it was a one off opportunity, i just made the fatal mistake of taking it out for a test ride and the deal was done
I think you know you want the Pinarello but just need convincing what to do with the cash you've saved when buying it at such a bargain price which i truly belief that price is, never seen an F12 that low so far although most have come with better wheels (sorry did i mention that you need to change them
)
Ask Mr friendly LBS to do a deal with the F12 and swap out the hoops, that's my suggestion.