Doing a simple google search I found multiple results that would give you info for each of the model years you inquired about. Here's one...it is for the 2019 model year...but you can see links near the top if you want to change to the 2018, 2017, 2016 model years...and the article also has a section that says "what's new for this model year":
https://cars.usnews.com/cars-trucks/bmw/7-series (see pic below for example of what's at this link)
BTW, the google search phrase that I used was taken straight from your quote:
2016/2017/2018/2019 G12 BMW 750i xDrive