I've only ridden one FJR, (mine), but I have ridden a number of others, from Hondas to Harleys. Without question my feej is the smoothest, least buzzy motorcycle I've ever been on. I suppose the wingabago is smoother, but who cares?
In 1975, I owned a Norton 850 Commando. Now that little bike vibrated so badly at speed that once you hit over 110 Mph, both the tach and the speedo became unreadable! I think I went 130+ on her once, but I could never be sure... :blink:
I traded the Norton in on a new Yamaha 750 triple, which took me across Canada and back in 1977. It vibrated a bit, but couldn't match that Norton. In 1978 I traded the 750 in on a new XS11 bagger, which was the smoothest, sleekest and scariest thing I'd ridden. Both Yammies had a bit of a buzz, which I fixed with fatter, softer grips. Yes, I wish I still had all three of those bikes..
My 2011 FJR had 0 Km when I fired it up at the dealership, and I have put more than 10,000 Km on it so far this year, riding almost daily since mid-March. Oh, it had a brief period of buzziness during break-in, but that gradually disappeared, and after the first TBS the engine has become turbine-like, with only a very slight buzz @ 4000RPM, and even this has become virtually imperceptible as it approached 10,000 Km. At certain RPMs, when the fuel tank is running low, I feel a slight 'tingle' on my knees from the tank sides. I suppose this to be a resonant harmonic, and it's something I've experienced on pretty much every bike I've ridden.
The FJR is the first bike I've owned that didn't induce numbness in my fingers after a few hours, requiring me to install softer/fatter handgrips. Despite the absurd speed limit of 100Kph, I regularly cruise at 120-140Kph, with the tach hovering right around the 'buzz' zone. I don't find it at all obtrusive, fatiguing or annoying -- I just know it's there, barely. At both lower and higher RPMs, the thing is glassy smooth. (Of course, at higher speed the beat-up roads around here transmit their own special brand of vibe!)
It might be interesting for the OP to ride a couple of other FJRs, and see if there's any difference in perceived vibration.