Right before the holidays, I spent a week in our Four Seasons Audi Q5; the S5 feels identical as far as the controls are concerned. Everything from the steering wheel to the MMI controller feels spectacular and consistent, which says a lot about Audi's attention to detail. Many other automakers have some inconsistencies between vehicles that are annoying.
As others have said, the S5's V-8 isn't dramatically more powerful than the new supercharged V-6, but it sounds spectacular and performs just as well.
Phil Floraday, Senior Online Editor