Al Mourjan Lounge is the flagship Business Class lounge for Qatar Airways in Doha. It is a very huge lounge (spanning 2 storeys) with 2 restaurants inside. I was initially expecting that I would be able to use the Al Safwa First Class Lounge (as I flew in on First Class but out to KUL on Business as there was no First Class to KUL). Unfortunately, I was only allowed access to Al Mourjan.
Being part of One World alliance, Al Mourjan is accessible not only for Qatar Airways Business Class passengers but also for One World First and Business Class travelers.