I would have thought the only reason to get the EK Credit card is for the Elite card on Emirates spend only (4 miles per GBP on the website), which is you earn at 0.25p per mile, you can just about wring out 1.16p of value if you upgrade a flex Y fare to J (e.g. LON-DXB, rt in flex is about 900 GBP, J is 1800 cheapest, saving of 450 each way, 39000 miles for the one sector upgrade).

Of course, to even get that means you need to spend 20k GBP with EK to earn the miles at the 0.25p rate. But still, the credit card isn't totally useless at this point, but a 1.5% cashback credit card is starting to look much more attractive than the EK credit card. Or you can redeem 55k EY miles for EY F LHR-AUH on 36k spend on the EY credit card... - 8p value there at 3k GBP equivalent! But that's a topic for the EY forum.