I am just curious about these 2 things since you mentioned them many times.
1) Is KE that expensive than OZ? If so, by how much?
2) KE not being so generous about premium levels has been mentioned but
do you mean KE(30k BIS miles in 2 yrs) vs OZ(25k in 3 yrs) for re-qualification? Or a big gap from MC to MC Premium?

I need to know these things as AA's multimillion miler who is considering moving from AA to KE because,
i) I travel LAX-ICN, LAX-NRT trips about 3-4 times a year each. Currently some on AA and mostly on JL, but either way I am getting tired of connecting at NRT for ICN trip.
ii) US legacy airlines' quality has become more ridiculous than ever, not to mention such dynamic environments of US corporations like PanAm, TWA, NW, and who's next... Anyone should be an idiot to keep million miles with any US carrier these days.

I am glad that I found this thread before I make any actual commitment.