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The business class service offered by AF is pretty good but be aware that the accommodation (in the newer C class) is not quite as good as some other competitors. The seats don't recline all the way to horizontal like they do in Club World (old and new) so you're pointing ever so slightly downwards. Also the IFE screen is in the seatback in front of you so offers less flexability.
That said it's still a very good service.
F is outstanding. I've only ever used it with miles and if memory serves me well the difference in miles between C and F wasn't that great. If you have the miles I'd recommend F.