At least one thing about the C14 is an undisputed fact: that single can is an abomination. Big STs are supposed to be dual exhaust, period.
That said, IMO all these build quality rants are unfounded. I've got two Kawis, and my wife has an '04 FRJa. Now, the FJR is certainly a cut above in terms of fit and finish and detailing compared to my '02 ZZR1200, but mechanically and functionally, there is nothing at all to be faulted with the ZZR - it's solid, well-built, and reliable.
Now, my other Kawi, an '07 ZX-14, is every bit as good as the FJR in terms of fit & finish and detailing. I see no reason to believe the C14 will be any worse.
Regarding fuel economy, well, let's just hope that VVT and gearing works some magic, because the ZX-14 is a thirsty pig, even taking it very easy. If I'm riding
very conservatively, I can just barely sustain 39-40mpg in 6th at highway cruising speeds. That's with no luggage, no power-robbing shaft, alot less weight, and me tucked-in most of the time.
As much as I love my ZX-14, I just can't get excited about the c14... I think if I needed to replace my ZZR with another touring bike, it would be an FJR... I must confess to enveying my wife's bike a bit.