I did the opposite - went from sport to standard. Must say, I miss the plastic for the wind protection. Highway riding is much superior on a sport bike, and so is the handling (no flexy frame, better suspension, etc.). Also, the niner is kind of quick at lower speeds but I miss the kind of power that makes you go WOW. Not that I would use it that often, though... Anyways, when the opportunity arises, I will definitely get an open class sport bike again. CBR is a good choice for the excellent midrange power distribution (see LDH dyno curve for reference).
One thing, though - when you get stopped, you are more likely to get a ticket on a sport bike. I have no idea how I avoided a ticket yesterday (got stopped for passing an unmarked police car on the right on a busy highway - yeah, that was dumb) but I think the fact my bike is nondescript and quiet makes a difference.
2005 Honda CB919F
2003 Honda CBR954RR (sold)
1990's Suzuki TS200 (sold)
1987 Kawasaki Ninja 750R (sold)
1984 Kawasaki GPz 550 (sold)