No, another example of a feature that SQL server has had for a decade or more (in standard edition). Maybe you're thinking of online index creation?

There are lots of reasons to criticize MSSQL (ridiculous cost, poor syntax/language extensions, awful text search, painful process for adhoc (non ETL) imports, etc...) but my decade old 2008 edition is still superior to PG in many ways. Why can't we have honest comparisons?