You are correct that Swedish and Norwegian also have noun cases, although their systems are less extensive than in Icelandic. Icelandic has four noun cases (nominative, accusative, dative, and genitive), while Swedish and Norwegian generally have two cases (common and genitive).

When comparing the grammatical complexity of Icelandic to Swedish, Norwegian, and German, it is subjective to some extent. While Icelandic is known for its highly inflected grammar, German also has a complex system of noun cases and verb conjugations. Swedish and Norwegian, on the other hand, have undergone simplifications over time and have fewer inflections.

It's important to note that complexity is relative, and what may be complex for one person or language learner may not be for another. Icelandic is often regarded as more challenging to learn due to its conservative features, including the preservation of Old Norse grammar and vocabulary. However, the degree of complexity can vary depending on individual perspectives and language backgrounds.

Overall, while Icelandic is often considered more complex than Swedish and Norwegian, the differences in complexity between these languages are a matter of degree rather than an absolute distinction.
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