Having flown KQ for the last 18 years - mainly in J, I have found massive cost cuttings going on, especially with their current financial and staffing woes.
Catering has been cut back, and on several flights in J, they ran out of wine or champagne.
If QR are a 8/10, I would rate KQ at 4/10. If you do have choices of KL, QR, etc., I would go with them.