Greetings Enicalyth… although it is true that measuring and comparing SFC at sea level vs. cruise is totally absurd, I have looked at several performance numbers for a B777-200 fitted with PW 4000, GE 90 and RR Trent 800 and although the RR has an advantage over the GE installation in the total weight of the propulsion system, the GE installation has a fuel burn advantage. If memory serves me right, the break over point was approximately four (4) hours of flight time. We are also seeing a significant improvement with the 3D compressor installation. Unfortunately the PW installation does not even come close…
To your other point, if I had a $ for every time some half-cocked bean counter ran off making decisions based on numbers they had no clue what meant… or if it even made sense, I would have been retired too…
And yes… enjoy your retirement
Dag