Can anyone share some info on what suitcase he used to carry spare batteries in?

Would be more fitting calling it overcast window light.... Title is misleading :)

"Program" as in a course?

Did he atleast say why he had the idea that you could only edit in FCPX?

Seems pretty stupid to just demand without saying why.

Of the three I would say FCP is the weakest. And the PR / AE setup will loose ground once Resolve 15 is out of beta. It will incorporate Fusion in this release and the editing suite is powerful enough now for most people's use.

I have already left PR behind. It doesn't make sense anymore, and it's colorgrading tools are weak compared to DR.

So... if you are indeed going edit it from start to finish and export and deliver yourself, I see no sound reason that your client "demands" you use a specific tool. Your best tool is the one that makes you works the fastest without the fewest hickups.

I would politely tell my own client that while they may have used FCPX themselves, I will not.

Worth mentioning... you need a US bank account to sign up for this.

The Fujinon MK lenses can be altered to have a MFT mount instead of the E-mount.
They are really really great lenses, albeit not inexpensive.

I wonder if the same is possible with the Sony lens, but it would probably cost the electronic function if you did.