From Longman Dictionary of Contemporary Englishthe Rolls-Royce of somethingthe Rolls-Royce of somethingBritish English informalBEST something that is regarded as the highest quality example of a particular type of product the Rolls-Royce of beers → Rolls-Royce
Examples from the Corpus
the Rolls-Royce of something• It is the Rolls-Royce of pens; prices start at £130 and rise to more than £5,000. 