Don't know much about Qatar Exec,
but heard from many sources that Qatar ist the worst amongst the middle east carriers..
I have heard from many sources that you are wrong..... Read the thread on the Middle East forum on Pprune and you will learn that EK and FlyDubai are the worst and that QR has improved a lot to become the carrier of choice for mainline at least in the Middle East, not sure of Executive but they are part of the same company.