The phrase 'unsurpassed knowledge' is correct and usable in written English.
You could use it in a sentence such as: "He has an unsurpassed knowledge of music theory."
Mr. Cohen had argued that Mr. Mohammed, with his unsurpassed knowledge of Qaeda operations, could help exculpate his client.
He has a true love of ideas, as well as an unsurpassed knowledge of Chinese legal problems and institutions.
He is a 48-year-old career diplomat who is fluent in Russian and has an unsurpassed knowledge of Russian civilization.
Her unsurpassed knowledge of the St Ives art scene – from its creative luminaries down to passing hangers-on – was always discreetly relayed.
Mr. Greenspan should use his substantial intellect and unsurpassed knowledge of government to ascertain and explain exactly how he and other officials missed the boat.
Her voice is trusted in the growing cannabis industry, as is her unsurpassed knowledge of the end medical and recreational user base.
His mem ory and his book knowledge are unsurpassed.
Competitive Edge Gear Wear's competitive edge is its unsurpassed selection and sales staff knowledge.
The real-time and routinely collected PROs will enable the development of a rapid learning health system with the potential to advance our knowledge of drug development, unsurpassed models of cancer patient care and a more patient-centred health care system.
As a means of reconnecting not just with forgotten skills but deeper knowledge, too, the books are unsurpassed.
O'Brien's knowledge of pedigrees and bloodlines was unsurpassed.
