This car would be more impressive if they had released it 5 years ago. But alot has changed since then. Even the 'F1 derived engine' is outdated. F1 has since switched over to V8's and Toyota has pulled out of F1.
And it doesn't weigh 3800 lbs. Its 3263-3483 lbs (from
http://www.lexus-lfa.com/), but that is still a little high given how much they're bragging about the usage of weight saving carbon fibre and aluminum.