The class code is not shown on the EK e-ticket nor is it shown in your frequent flyer profile and itinerary. The only indication of class being flown is the referance to First, Business or Economy under the heading of "Travel information" which should be just above your fare information.
AS a rule the fare classes are:
First P,A
Business J,C,I,O
Economy Y,E,R,W,M,B,U,K,H,Q,L,T,V,X