chorned,
not a direct reply I'm afraid, but you have chosen the Olympus, which was not specifically a civillian engine application. Since the version on Concorde was simply a re-hash of the Avro Vulcan bomber Olympus engine EIS on the B.2 variant was in 1960, so as a technology/SFC comparison you are looking at a 45 year time gap. And this type of engine had no bypass - it was basically a pure jet. So no real direct comparison in large civillian a/c today.
Regards,
N1 Vibes