Just flew four flights on EK, all J-Business Class, two on an A380, and two on a 777. None of the four had any massage functions. On the first flight, when the FA found out it was my first time on an A380, she spent several minutes explaining all the various functions and amenities (very sweet young lady). I'm assuming the non-mention of a massage function was due to the lack of a massage function.

The first time I had to use the restroom (A380), I naturally walked forward, since I was sitting near the front of the first J cabin. When I pulled the curtain back, there were two FAs sitting there. When I explained I was looking for a bathroom, they pointed me towards the rear of the plane. Right next to them was a bathroom, so it didn't take a brain surgeon to figure out that must be a First Class only facility.