I can't really agree with you on the Lexus bit.
But you are right this doesn't look like a Jaguar. Just like the E-Type didn't looked like a Jaguar in the sixties. Jaguar needs a change. They should have done it with the S-type.
I like this new XF, off course it isn't as sharp as the concept. (which is a bit disappointing) The interior is Jaguarish, or in other words pretty nice.
And i might even get used to those new headlights.