The GSX-S1000FZ has so far been a GSX-1S000F in desguise. Read: a 1000F with a different paint job. The engine is the same inline four as the 1-liter GSX-R and the ZF offers the exact same specs as the F, right down to the weight.
For next year, it looks like Suzuki has dared a few changes to the ZF: the bike gets a new throttle mechanism, and of course, a new color scheme. If you really like a blacked out look with matte black paint, you’ll love the 2019 GSX-S1000ZF for an extra $300.