Will, nice balanced review, as usual. I especially like the fact that you gave it a thumbs down based on Lafuma's 25F rating but a thumbs up based on a 35F rating.
I found this statement a little misleading, though:
"Lafuma’s temperature rating for this bag is 25 °F/-4 °C, tested by an independent lab in compliance with European Standard EN13537. The 25 °F rating is the “Comfort” rating within that standard, which is roughly equivalent to the US sleeping bag rating system."
It appears that Lafuma has done a good job in burying the actual results of the En 13537 test, preferring to substitute it's own suggested rating. I really doubt that this bag earned a T-Comfort rating of 25F. The temperature ratings derived from the En 13537 tests tend to be on the conservative side, if anything.
For example, the Marmot Hydrogen mentioned above has received a T-Comfort rating of 40F and a T-Limit rating of 31F, according to the En 13537 standards.
Also, note the response of Mike Fuetterer in this thread:
"In Europe the bag is rated Comfort C 7° Extrem C 2° in F 44,6 and 35,5°.
Which fit the picture better."