Just booked some J class flights to Asia ex MAN, but on my dates EY, SQ, EK were pretty pricey. QR not bad, but the best value fares for me were LH so it's MUC /FRA for me-sadly no A380 on my routes either. If EK/SQ/EY want to fill their premium big machines, they need to be a bit more competitive. Very surprised that the EK A380 J class was the most expensive by a mile, so maybe they are filling it anyway.
Dependant on the fares, I would have gone with QR if I were you - best business class in the sky - officially!