How do the people of Iran differ from other southwest Asian peoples?

Answer 1

What distinguishes Iran is that it is majority Persian ethnicity (as generally opposed to Arab ethnicity). It is also the largest Shiite Islamic-majority country (although it is not the only one as both Iraq and Bahrain are Middle Eastern countries with Shiite majorities).

Answer 2

Iran's 66.6 million people differ from those of other Southwest Asian countries. More than one-half are Persians, NOT Arab or Turks.