Some restaurants ace their restaurant week debuts (many people try a restaurant for the first time during Restaurant Week), others make them complete faux pas - and I am happy to say that Le Bec Fin, or rather Le Bar Lyonnais, does the former. LBF doesn't participate in restaurant week but Le Bar does, and my friend and I were seated in the mezzanine in the technically-LBF area. For that reason, I can't comment much on the ambience of Le Bar other than that it looks really, really dark (I saw it in passing to and from the restroom).
Pros: Restaurant Week - food, presentation, decor, and as usual, SERVICE SERVICE SERVICE
Cons: not even the usual con of the price (which is worth it anyway but still) when you go during restaurant week!