The thing is when it comes to luxury cars like those usually performance isn't that important, altough it's always nice to have some. The Lexus is impressive, but then again it has a 380bhp V8 engine, the most powerful of the comparison by quite a margin, so it's not that surprising that it's the fastest.
Well the BMW's are more of sports saloons than luxury saloons, and as a result they appeal to a different audience. Kitdy would probably like them very much.