Man, for what it's worth, I think you are just experiencing some "grass is greener (and maybe newer)" fever. My wife has a Land Rover (same genetics), and that thing is a pile of garbage. I mean seriously, it is THE worst experience I have ever had with a vehicle. Period. It is only a 2010, and it has been in the shop more often than not, during our period of ownership.
Don't get me wrong, I happen to think that Jag makes some really good-looking cars, and they're fast and powerful and smooth, and all that good stuff. But at the end of the day, it will be a very long time before I partake of a Brit make again.
You gotta live while you're alive, for sure. Just be aware of that grass is greener mentality, and the flip side of that grass, as well.
Oh yeah, and they...are...kinda...old-manish... Sorry! Just don't forget to pull your white socks all the way up to your knees when you get out, and all will be fine!