Have sailed a Fanatic Falcon 110, in my opinion way faster. Extreme loose ride with plenty of control.
The biggest difference is that with a good full-race sail like NP RS Racing the Fanatic performs really well. But with freerace sails or freeride sails it doesn't work that nice...
The Isonic is more capable of taking freeracesails, it is still quite well balanced. However lots of bigger isonics of earlier years were sticky and in terms of speed not that fast...