I had an 04 919 and a 05 VFR.
I'll try to keep it short, they are very different bikes obviously, the 919 was alot of fun but when it came to going places and riding for the day...the VFR For the win!
-The VFR had amazing brakes, I mean just insane brakes...the feel was very good (mine was abs with combined braking system)
-The VFR is much more comforable, highway speeds and such.
-VFR handled better than the 919, high speed corners felt composed and it took bumps fairly well for stock suspension
-919 felt faster, and probably is
-919 was alot of fun to ride
The 919 was fun as hell, and made rides fun (not that the VFR didn't)
It really depends on what you are looking for, if you are looking at doing day trips and going on long trips and not feeling like someone kicked the crap out of you...you should get the VFR.
If you are into shorter day trips, or don't mind the pain at the end of the day...or you looking for alot of fun on your ride...keep the 919.
03 DRZ 400
05 VFR 800A
05 GSXR 1000
04 Honda 919
00 Honda Shadow ACE