Howdy BW,
KAL is way different than EK to fly for. Professionally I found EK much better, but in the end life in the UAE with EK forced me to jump to KAL. Commuting to OZ is working well but it is still a long time away from home each month.
The bases for the 7 off 10 on (or whatever you end up with) change every time there is a seasonal equipment change. Last month there was an A330 Syd basing this month it is an 747 basing, hopefully in Jan or Feb it may be an 777.
Do not plan your career move on this basing policy, they are good if you can get them but they are not contractual or permanent.