For CX136, the "H0" in "Y8 B8 H0 K4 M0..." is quite strange, but it is fair to assume there are only 4 economy seats left.

For CX846, there is no economy seat left.

Having said that, there are many who do not have seat assignments and some cannot even do OLCI - either no status or members of tour groups; some Y passengers may do mileage upgrades. So there may still be a chance for some or all of you to sit together.