Funny enough I was at the show this weekend and finally had the chance to sit on the FJ-09...and something that checked all the boxes quickly turned into a nope. Now looking towards the FZ8 or Fazer8. Any naggles that you have about the Fazer?
To add to previous comments:
Porky is relative. Fazer8 basically replaced a VFR800 in my stable of two. That was porky.

Fazer8 is very similar to FZ1, same frame and some other parts, very similar fairings, with the engine being a downsized version of the litre bike.
I prefer it to the naked version because of the long distance riding I do.
Range is not the greatest, especially after the VFR but I can squeeze out 280-290km out of it while touring and still have a couple of km left. Local riding I get about 250km on a tank. So it's not a tragedy. I generally take a break every 2 hours anyhow.
Buzzing - I haven't experienced any (yet).
Suspension - was upgraded and is fully adjustable from 2013 I believe. That is the model year I got. Makes a difference. I tweaked it a bit for my 220lbs and it is quite decent.
Seat - found it uncomfortable with too much forward slant. I fixed that issue by purchasing a snowmobile gel seat cover from Amazon and trimming it to size. 20 bucks.
All in all - highly recommended. You can still find them new at some dealers, with good discounts. Even used should be a great buy. They haven't sold well here. Came out too early I think.
Nowadays this class of motorcycle is booming. Everyone coming off SSs. For reference - I paid something like $6,500 for mine with 1,500km on it mid last year. Had a Puig screen and fender delete. Private sale. Dealer wanted around $7,700 for a 2013 demo with 50km on it. Plus tax.
A Delkevic carbon fibre muffler brought out a great tone out of the exhaust. That's the only mod I've done. Stock exhaust looks like a medieval cannon.