I have noticed too the sharp increase on EK F and J class fares ex-middle east and specially Dubai. However, I suggest that you stick to them because of their strong network and excellent products ex-dubai. I am sure in the short run EY and MH will follow suit and increase their fares but not as much as EK. It is a rule that home carrier always charge more than transfer carriers. An example is LH which charge the highest fares ex-Germany and still doing great due to the prducts offerings.