It's quite interesting, this review. For starters, we learned that Audi starts with the smallest car when developing a new platform. That's because it's hard to squeeze all the components and systems into a tiny package. By contrast, the BMW and Mercedes engineers usually start with their largest cars (the 7 Series and S-Class).
In any case, while the A4 might not be as beautiful as the C-Class, it's packed with gadgets. Everything you can buy on the Q7 is also available here, including the latest Nvidia Tegra chip, a limited slip rear differential and "semi-autonomous" tech. It's amazing to see something as small as the A4 keeping lanes and adapting to traffic without driver input, just like the S-Class.
When the A3 sedan was launched a couple of years ago, this editor concluded it has far more modern equipment and virtually the same amount of cabin space as the A4. But now, the 4er is a class leader in many aspects.
The Audi powertrain engineer also has something interesting to add to this review. Apparently, the new 2-liter TFSI engine's combustion cycle essentially turns it into a 1.4-liter by closing the intake valves really early. With that kind of tech available, the somewhat cramped Lexus IS 300h could be in big trouble.