As you can tell by the image above, the SF is based on the Gixxer. The front of the motorcycle is where the differences lie.
The swept-back headlamp design is exactly the same as the Gixxer’s, while the full fairing apes the ones on Suzuki’s larger capacity GSX-R motorcycles.
Air vents that sit on either side of the headlight are there for aesthetics rather than performance gains. Moving back, the rest of the design is just like the Gixxer’s, so you get the same muscular fuel tank, single-piece seat, a stubby rear with split grab handles and integrated LED tail-light.