@Slowlycatchymonkey, @Skippy, and @Grasshopper's Ride can tell you about RE's.......they're not my sort of thing.
I know I'm a bit biased but you should take a look at a Honda CB500X.
I went down in size to get one and I find it great! 80+ mpg!
Sometimes you just know that a bike is not a good fit for you.
In cases like that it's got to go. I had a similar experience with a TDM900 about 20 years ago. Nothing wrong with the bike, it was just not a good match for me.
What alternatives did you have in mind? And what sort of riding do you do? Shorter runs or touring?
The XJR will be ahead on that......but that's about it.
You're talking an R1 engine against an oldschool aircooled lump.
Don't get me wrong.....I love the XJR. But in terms of performance against the Fazer 1000 there's no comparison.