ICN is definitely a detour, and I don't find their product to be superior to QR or CX. In terms of seating, I would lean more towards QR and CX, but in terms of convenience, I'd prefer SQ.

If you by any chance follow the CX forum, you'll find that the quality of food in the CX HKG lounges has deteriorated greatly, which is a pity. I would still go for CX over Al Mourjan in Doha, given how it's relatively easier to get a shower in the CX lounges (should that be of any importance to you). OZ is definitely out of the question, and I honestly won't regard them as a reasonable option.

Overall, I'd lean most to CX and/or SQ

Also, SQ has their own private lounge in Jakarta which is nicer compared to the mess the other lounges are. QR and CX uses the same lounge in CGK.