The latest German magazine AutoBild, the largest automotive paper in Europe, made a comparison between 5 popular subcompact minivans: MB B-Class, Mazda5, Toyota Corolla Verso, Opel Zafira and Ford Focus C-Max.
AutoBild makes good comparisons, because they offer two different test results, first is without price and resale value, and the second one with these two criteria included.
The Mazda5 won the test part, but due to higher costs became 2nd after the Opel. Ford came to 3dr place, Toyota to 4th and, beleive it or not, B-class was the last. About the 5 they say: large amount of space, very variable interior, comfortable und well equipped. A great compact van for all needs, but the price isn't really attractive and its resale value probably not good (German journalists complain about resale value on every non-German car).
The B-Class won the last place because of the high price (B200), poor equipment and lack of space.
What they say about the rest, not available to Canadian drivers:
Opel Zafira: its test characteristics are just a point worse than those of the Mazda, but it has a better resale value (which should be true, the Zafira is the most wanted used minivan).
Ford Focus C-Max: a true sportsvan, made for daddies. But families need space and the C-Max doesn't offer a lot of it.
Toyota Corolla Verso: well priced, but less exhilarating. Has practical qualities.
I scanned the pages, they're of course in German, but you can take a look at the pics despite that: