As of 0.2.1 beta 6, FastFormat's performance test programs now also compare against Andrei Alexandrescu's Loki library's SafeFormat component. The results clearly demonstrate FastFormat's performance superiority over this library, as they do over C++'s standard IOStreams and Boost.Format.
Given the fact that FastFormat is more robust and more flexible than these other libraries, and is highly expressive, I think it's fair to now claim that it is the pre-eminent formatting library for C++. All that remains is to provide the planned width+alignment+fill functionality, and it'll be effectively complete.
I'll be looking for input/assistance in the new year for packaging and porting. If anyone wants to volunteer, you'll be most welcome.