Only EK pilots I know of that have left for EY are 4 or 5 FOs who are returning to live in their home town. Not to say that there are not any others though.
Package wise, pay is close, no pension fund, and housing and school are less, so not really a worth while option for most I think. There is however a possibilty that command may be quicker there but who knows what will happen tomorrow.
Rumour has it that the pilot package at EY is under consideration at the moment, and that it may well improve to attract more fellas. Lets hope so.
Don