No, they don't. I flew DXB-MLA (stopover in LCA) couple of times in business, last time in May. I was tired so I wanted to sleep in the morning but they neither had mattresses, nor amenity kits, which is surprising considering the total flight time of 8h15min. EK treats this route like two separate legs despite passengers flying all the way to/from MLA/DXB don't change or leave the plane in LCA. I flew DXB-VIE 6h flight in business this month and they had both mattresses and nice amenity Bulgari kit, but nothing in DXB/MLA route. I wonder how EK determine these things. I just flew DXB-WAW 6h flight in business and they had mattresses but no amenity kits...