All valid points made by others.
Still, "large scale project" is a relatively ambiguous term. How large? And large in terms of what? A large website? A large app? Large codebase? A lot of pages? Complex forms? Math calculations? etc..
You can have a very large project that has only 2 or 3 http endpoints, and for that case, the framework is probably largely irrelevant since most code will probably be plain php. (or python, or ruby, but that still doesn't mean you have to use django or rails)
Think first about your app's architecture, structure, data, etc. And then consider if you can easily use F3 (since you're already used to it). If there are many features or functionalities that you'd be better served by another framework, then go for it.
In conclusion, the framework you choose should be just salt on your app.