I think so. Don't forget that CX was flying them on mostly regional flights then; I don't think they ever flew CV880s on flights of over 4h - no further north than Tokyo, or south than Singapore - don't think they ever went to Oz with jets until the 707s came along.
I always recall Spantax flying CV990s into Dublin, in the early 1980s - and I regret very much not having flown on them.
I think SR were about the last major carrier to fly 990s, and CX, among the last to fly 880s; both retired their fleets around '75.