I'm relatively new to EK and have never flown QR. Must say that I'm very dissatisfied with the hard product on EK, specifically the huge differences. My first flight was on a -300ER with the fancy business class seats, and apart from the horrible decor it is a very comfortable seat/bed. Connected directly to a -300 non-ER with the regional C-class, and what a contrast that is! Still, for a 4 hour daytime flight it's quite ok, but apart from a crappy seat you also get a crappy folding out screen instead of the 20+ inch.
Next flight was on a -300 non-ER, which seemed to have a seat closer to the new C-class on the ER, but not quite. Could be wrong though, I was tired at that point. I connected in DXB to a an A330 and boy was I in for a shock - I mean, does anybody else do 2-3-2 business class seating on an Airbus? Screen size was small, quality was crap and the seat was a joke.
Last flight was a redeye from Europe to DXB on a -300ER, but one fitted with the horrible regional C-class seats. To say I was disappointed would be an understatement, and I'm glad I chose to depart a day early; the regional seat is simply impossible to catch a decent sleep in.
Haven't tried the A380 yet and, frankly, I'm unlikely to fly EK ever again unless they standardise their seats.