Want to add a data point here - just booked PRG-ICN for 2 people on CSA. One-way J ticket cost 25k + £160 (mostly YQ). Call was painless, took less than 20 minutes to get ticket issued. Availability seems to match what I checked via FlyingBlue.
I can view the itinerary on Etihad website, but cannot choose seats. CSA website errors out when putting in the PNR. Looks like CSA only has 1 wide-body leased from KE serving this route, but it's definitely a good redemption