I've ridden quite a few newer bikes with the thoughts of eventually replacing the 919 and none of them have come close to making me consider it. I really like the FZ09, but the power delivery is quite different, and doesn't have the intoxicating low and mid range yank that the 919 does, although it has slightly more top end feel. I also didn't find it as comfortable. I've ridden a street and speed triple as well and had simlar feelings about those. I'd love to try out a ktm super duke GT, but that's 4 times what you'd spend on a 919 and all the mods you could throw at it.
For what you have listed as your usage I really don't think (or at least haven't found) a bike that can fit those needs any better or even as good as a 919 can.
Since you mentioned the GT, I’ll throw in a few thoughts.
I had a 919 and in October replaced it with a 2016 Super Duke GT.
IMO, it is a severely underrated bike in the US, but very popular in Europe and Australia.
The R is obviously extremely popular in the US.
My personal thoughts are that it is because American riders prefer comfort over sport in their sport tourers. And they GT heavily leans to the sporty side, sacrificing touring comfort (still very comfortable when compared to nakeds and sport bikes).
Because of this, and coupled with a new re-design for 2019, now is a great time to purchase a GT.
The MSRP is $20k (vs $18k for the R), but their are several significant differences to the GT.
Mine was brand new (old stock) and I got a $3500 factory rebate, $2000 additional off from the dealer, and no dealer fees (just taxes).
Here is a current deal on a used (6k miles):
What the GT adds (over the already great specs of the R):
-More comfortable seating (rider and passenger).
-larger gas tank, that also adds wind protection
-luggage (that comes off cleanly, no racks, in 15 seconds for a naked-ish look).
-my personal favorite: electronically controlled suspension. 3 suspension settings and 4 pre-load settings.
I plan on keeping it stock as the power is more than enough for me and the suspension is already great.
Maybe a slip-on for aesthetics and exhaust note.
So shouldn’t have a lot of extra modification costs that I might have had with other bikes.
I did buy an extended warranty (have 6 years total), something I don’t usually do for anything.
As all that technology and European does concern me a bit.
The GT likes to hang out around 5k rpm when cruising. And has insane torque from that point on.
It has great torque everywhere but I actually felt like the 919 was just a bit snappier from 2k-5k.
But that could have been perception as the 919 is lighter and completely naked.
Either way, it is mental, but yet is completely under control and feels very safe and stable at very high speeds.
As long as you keep the rider aids (traction control and ABS) on, it is a very manageable bike and not intimidating at all.
And the engineers did a great job of not letting you know/feel when the aids are “helping you out.”