BMW and Audi's interior design are both excellent. Simple yet elegant. Out of the German 3, I like Mercedes' interior design the most, simply because they're more adventurous, yet retain the luxury quality that one would expect from a Mercedes.
The IS has a nice interior design in comparison to its rivals. Apart from that, I dislike the current generation of Lexus interiors, and would not put them on par with the German 3. (The old GS had one of the best in the industry, :/ )
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