I am a 'big' 6' 2", and the boss is 5'11". The couples seats in J on the EY 777 are excellent as you are not worried by any of the traffic in the isle. EUROPA is correct in that the leg room is not as good as CX or even BA, but if you like talking to your partner they are excellent.
Avoid the isle seats in the middle, not good or private in my opinion.The window singles are magic however.