From Longman Dictionary of Contemporary Englishstreets ahead (of somebody/something)streets ahead (of somebody/something)British English informalBETTER much better than someone or something else James is streets ahead of the rest of the class at reading. → street
Examples from the Corpus
streets ahead (of somebody/something)• The Scandinavian countries are already streets ahead in this area.• And streets ahead ... Bonnie brings a touch of magic to a Broadway favourite.• Sorry times, indeed, for Coventry, whose Midland rivals are streets ahead in strength in depth.• As pure driving machines, there is no real comparison - the Mercedes is streets ahead. 