Before we begin, I will ask you two questions.
You traveling as a single or a couple?
If it's the Premiere, it would be their 777-300ER. Too bad Air France can't provide their seat maps with as much details compared to BA, CX or QF.
If you're traveling as a single, it's better off if you go with 1A or 2A seats if you want less distractions. 1L or 2L are also good seats for single travellers, but it's the galley up front especially for 1L, that makes it noisier and the light can distract your sleep too.
The seats themselves are not as private as British Airway's First Class Demi Cabin, but feels roomier though. You can also use the following link to give you an idea of what a professional opinion for the Premiere seat. It's largely due to the lack of height of their partitions.
www.flatseats.com