I'd say they're comparable in a way, in that neither are going to bought by the man in the street who doesn't know a whole lot about cars. Granted, one's a 2+2 and one's a full saloon, but still they're both cars that go very fast, handle very well (probably, can't see lotus failing on that one) and are going to have iconic status, if they haven't already.
Put it this way: I suspect most of us on here would pick the GT-R over the eagle for that kind of money, and we're all car nuts I'm guessing.
But yeah, overall I will happily concede that they're not direct competitors for each other. I'm daft, but not yet totally stupid.