Coz I know one of my friend who entered before in qatar. She didn't have any stamped on her passport, same mine she have working visa too but as she arrived and visa checking in qatar they didn't asked anything she just show the paper visa that was printed from the internet (electronic visa).

But I'm still thinking how about the immigration of the countries (thailand/hongkong/singapore) if they will be needed the stamped visa on my passport so could fly going to Qatar..