Superlative without comparison?

(Sweden)

Some interesting point regarding why English/Spanish translation is hard.

However; as far as my (admittedly non-native) english skills tell me: "Hardest" implies a comparison. The statement of its being the hardest not only suggest the need for comparison to some other translation pair but to all other such pairs including English as one of the two.

In short, nothing much wrong with the article except it's totally off its said point.