I think it is 80k JMB to fly business return from TYO-PER with Cathay Pacific (via HKG) and Malaysia Airlines (via BKI). Personally, all other things being equal, I would pick HKG for better ground service (at least).
55k for premium economy. Check out the JMB redemption chart here. link
Since you are redeeming for 4 seats, it may be worth while checking availability 1st. I am not very familiar with JMB redemption but I suppose you can ring up and ask about your options and what’s available. Cathay Pacific is known to release unsold seats around T-14 days before departure too.