Quick charge port (which includes 6.6kW on board charger vs standard 3.3kW) is an upgrade on a 2017 S. I think it was standard on the 2017 SV. The big difference between the S and SV for 2017 IMO is that I think all the SV's came with the hybrid, heat-pump, heater. This is much more efficient at cool temperatures although it doesn't make much difference below 20F or so. I have an S and live in CO and I don't really miss the heat pump as the climate here is mild and sunny in the winter and my drives are short.
It may also come with a heated steering wheel. The display is bigger and more capable and shows a lot of info that the S will not. You get alloy rims instead of steel rims. There are probably a few other differences but those are the ones I remember.