Enjoy CX. Old or new seats, its still in F class, and the product in the air is one of the best around.
10 years have passed. Many things have changed. But changing airlines just because someone told you that a certain product isn't available might be a but too much.
I find that when flying straight through to Australia from the UK, my jet lag actually adjusts better without a stopover going there. On the way back, you migt want to consider a stopover in HKG and see what the Chinese have done to the place since 1997!