Just an update on this from me. We've now had two test days with the f65. It's a big camera for sure! The fan does seem noisy compared with an alexa, although not too worrying as still much quieter than a film camera. Will see how that changes in hot interior scenes...
The timecode input is on the recording deck that attaches to the back. It is a bnc. We've attached an ambient sync box as don't trust it to hold time on its own but the Sony rep said it would. Having left it without the box on for a while I think it would prob be fine but better safe than sorry.
One interesting point is that post said the sound and picture rushes were all consistently 1 frame out of sync. The Sony rep said that was correct and is to do with information processing time. The camera guys set the camera time to 1 frame forward and post seem happy that has sorted it.
Simple menu system and everything is pretty normal and straight forward to use. If the fan noise doesn't turn out to be too bad then it seems like a nice camera to work with, so long as its not me heaving it about all day