The chance of a quest reward is small (?%). You will know when you've gotten a bonus upgrade by the small popup message box telling you the quality was upgraded (will not have any ilvl info). For uncommon items, you have a chance for a rare (+10 ilvl) or epic (+20 ilvl) version. DBs like Wowhead should have some indicator on quest pages that a quest reward is a candidate for a bonus upgrade and item pages should have links to upgrade variants. Followers are not affected by the / .