JAL F/O's - again it depends on years of service - but somewhere between 40 - 60% of the JAL Cap's salaries.
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I also hear that the japanese pilots fly their schedule, then are basically always on-call for the other days."
That's a new one. They get a minimum of 10 days off per month, are usually scheduled for at least 1 meeting (Japanese love their meetings), and may be rostered for standby on the other days.
They usually fly between 40 - 50-something hours most months.....the lowest I've seen was 32 hours.
Yes, they do get the 2 bonuses per year.