Cheapest LH to SFO versus prices from FRA
Z-class from BUD 1460 EUR vs 2964 EUR
D-class from MAD 2724 EUR vs 5084 EUR
C-class from MIL 3659 EUR vs 5980 EUR
J-class from MIL 5123 EUR vs 6480 EUR
A-class from STO 6417 EUR vs 10930 EUR (F-class)

So this new ordering of upgrades will make some people quite happy. I know I would happily fly on C-class to MIL if that put me almost on top of the upgrade ladder and give me 200% miles.