"strikingly impressive" is correct and usable in written English.
You can use it to emphasize how impressive something is, or to draw attention to an impressive quality. For example: "She gave a strikingly impressive performance in the play."
This is not something you can scrutinise in science labs but Eaton's numbers are strikingly impressive.
Reminiscent of the great Secretariat or Zenyatta, this strapping bay colt is a strikingly impressive physical specimen.
The blend of modern interior design and an old colonial building makes for a strikingly impressive hotel.
One of the most interesting of these companies is Mapzen, an "open, sustainable and accessible mapping platform" that offers a suite of free, strikingly impressive tools.
To concentrate on the successes, Mansfield's second and third collections, Bliss (1920) and The Garden-Party (1922), contain strikingly impressive pieces such as Prelude, The Little Governess, Je Ne Parle Pas Français, The Voyage and The Daughters of the Late Colonel.
"The Mildmay Chase winner was strikingly impressive as he followed up a success at March's Cheltenham Festival, achieving a runaway, 10-length decision in a very good time.
Conditions are strikingly similar: impressive prosperity, accompanied (as the golden 1950s were not), with a strong sense of social and moral decay.
They are all impressive and strikingly original achievements.
An impressive feat of imagination, and a strikingly clear distillation of both artists' distinctive languages, the album strongly suggests an artistic dialogue.
It is strikingly composed of two extinct volcanoes, its tall twin cones making an impressive counterpoint to Stromboli's single cone visibly puffing out smoke to the north-east across the Tyrrhenian Sea.
Despite the laurels associated with the Washington Post and the impressive-sounding background of its health editor, the June 15 story is strikingly poor and worse, irresponsible journalism.
