"a superb expression" is correct and usable in written English.
You can use it when you want to describe something that is exceptionally well stated or expressed. For example, "Her speech was a superb expression of her beliefs."
This rhetorical artistry found its most superb expression in the maqāmah, a form invented by al-Hamadhānī (died 1008).
When in Italy, look also for Stefano Mancinelli's superb expression of both grape and birthplace.
Palladino (Serralunga) - A jewel of an estate in the town of Serralunga that offers beautifully crafted Barolos with superb expression of local terroir.
A 5-point Likert scale was used to judge prosodic ability, with "1" corresponding with "could not determine intended condition", to "5" corresponding with "could absolutely determine intended condition; superb expression".
And for good reason: They are, for the most part, fairly accessible and widely available with many superb expressions priced at less than $65.
Josh Schell and Megan Trout fill the vulnerable roles expertly, with Schell revealing Nick's feelings through a superb symphony of facial expressions.
This is a superb book, wonderfully clear in thought and expression.
In another, spicier work, the aging, satyrlike Jupiter uncovers the sleeping (and almost audibly snoring) Antiope with the unmistakable expression of a connoisseur sniffing a superb wine.
Art historian Hugh Roberts has praised the State Apartments as "a superb and unrivalled sequence of rooms widely regarded as the finest and most complete expression of later Georgian taste".
Barry Banks was a superb Oreste, creating the wonderful illusion that his cascading roulades were not some artificial vocal preening but the organic expression of emotion boiled over.
