As a Gold for Life GF FF I can assure you the chefs aboard GF's old F Class and now Falcon Gold class are FULLY qualified 5* hotel standard chefs. The food was superb and GF won for 2-3 yrs in a row best F Class food.
It was a superb service and one of the main reasons I flew GF from Sydney. That said GF's F fares were cheaper than EK's J class so it was a no brainer. 8 sleeper seats, PJ's, 2 lavs, chef usually from Aus, UK, France Malta, Italy, just to name a few! - who unlike 3rd world cabin crew knew how to hold a convo and had life experience.
EY could do a lot worse!