Here are a couple of newer 2-door roadsters we saw in Congledon, England (southeast of Liverpool) in 2006:
The Ford StreetKa (discontinued)

nearly a meter longer than the smart, 100mm shorter, well over 120kg heavier, and most of the Ka models didn't have as much horsepower.
The Daihatsu Copen

700mm longer, 300mm shorter, 80kg heavier, and still with about an 87hp engine.