"an impressive level" is grammatically correct and commonly used in written English.
It can be used to describe a high or noteworthy degree or amount of something. Example: "The company has reached an impressive level of success in just its first year of business."
Onstage, she's got an impressive level of icy hauteur, as if nothing can impress her or change her essential belief in the meaningless stupidity of the modern world.
That was an impressive level of effort.
"But they also provided an impressive level of customer service that you rarely find today.
Given the huge amounts of excess capacity in many sectors, this is actually an impressive level of investment.
There are also complex polygons but I shan't bore you with that," he said, demonstrating an impressive level of geekiness.
He explained: "We see an impressive level of support for multicultural Britain, despite continuing concern about immigration.
The production, with 25 actors and 6 musicians, is an ambitious undertaking, met with an impressive level of skill.
The selection team frequently explored these sorts of questions with an impressive level of warmth and rigour that even companies who weren't nominated would have found gratifying.
He's actually displayed an impressive level of humility, not a quality with which he is widely credited, through this whole process.
'We have a saying: "Whenever two people are together they form an association".' Whatever its faults or self-deceptions, Christiania displays an impressive level of association.
There's an impressive level of creativity and ambition in this indie publishing collaboration, something too often missing from mainstream publishing today.
