Originally Posted by Voxxel
Afaik, group members' achievements can be queried but as you say it's not possible for quests?
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That is correct. You can query which group members have a quest in their quest log:
IsUnitOnQuestByQuestID(questID, unit)
...but if it's not in their quest log, there's no way for you to tell whether they already completed it or not. If you need to know that, your only recourse is, as Mazzop said, to get them to install an addon that responds to queries from an addon you're running. Considering you're working with strangers invited to a PUG, you're not going to get them to install an addon, so the realistic answer is that what you want is just not possible.