"exceptional knowledge" is correct and usable in written English. You can use this phrase to refer to a particularly good or detailed level of knowledge, as when someone is an expert on a subject. For example, "He had exceptional knowledge of ancient Greek literature.".
We will greatly miss her warmth, eternal optimism and exceptional knowledge.
Angela's exceptional knowledge, skills, attitude and behaviour have contributed significantly towards the short, medium and long term objectives of the company.
Left his life as he lived his, with extraordinary grace and dignity, leaving his friends and family with the fruits of his exceptional knowledge.
Bill's exceptional knowledge of modern art and his genuine appreciation for the work of artists and the Colony made him a valued member of our Board for 24 years.
Strengths Truly exceptional subject knowledge, particularly in potions.
Competitive Pricing Our hourly rate is lower than main dealers and we provide quality parts and exceptional technical knowledge.
The following day (a less blustery one) I took in the same spots from land with Aotearoa Tours' excellent guide Darryl – who came equipped with that trademark Kiwi sense of humour and exceptional local knowledge.
When I feel like I can't trust my brain 100%, Ludwig really comes in handy. It makes me translate and proofread faster and my output more reliable.
Claudia Letizia
Head Translator and Proofreader @ organictranslations.eu