I am just about to post a project shot on the F3 using sLog. The SDI output of the camera including timecode was fed to a PIX240 external recorder which can record ProRes or DNxHD. Both of those codecs can be edited in FCP without L&T.
Otherwise the cameras internal recording format is XDCam EX
The images using sLog are really nice. Sync was done by running time of day code and jam syncing the Sound Devices 788t twice a day. The audio was transmitted back to the PIX240 so there was no need to sync rushes. After the shoot it was discovered that there was a two frame discrepancy with the timecode as there is delay from the F3 to the SDI output of two frames (PAL 25 shoot). The team discovered later that there was the ability to compensate for this in the PIX240.
All up I can recommend the camera for lovely images and with the external recorder you can get edit ready codecs and great quality. Timecode sync, apart from the two frame offset was absolutely lock solid against the audio.