I rode one around Miller Motorsports Park 2 weeks ago (I was at the Yamaha Champions Riding School for a 3 day course). I absolutely loved the bike - it was so comfortable to sit on, and the power was much more accessible than the R6's. I went much faster on the FZ8 than I did on the R6!
If I didn't have the FZ6R waiting for me (and I had an extra $11,000 CDN...they're way more expensive up here), I'd get one of these. It's a super fun bike.