Was/is "one of" my dream lenses. As I'd love to have used it with my Sony PMW-F3 for general doco / R&G / event coverage.
And compared to what it originally cost, then $1Kis "cheap"(ish).
But.... the only other cameras you can use it on is the F5/F55.
Nothing. Else.
And there will never be another camera you can use it on. The F55 is the end of the road, there will never ever be a better camera you could put that lens on. Ever.
In the medium term this lens is going to trend down in value to a big fat ZERO.
So I'd look at this way:
Are you a working professional? Will you have at least 20 working days over the next few years (whatever the working lifespan is of your FZ Mount camera) where you'll get at least $50 of benefit from using this lens? (be it due to working faster/effeciently, or just a more painless day for you, or due to charging a higher rate, or however you define "value) Using 20days times $50 = $1K as the math here, but you could structure it differently, say 50days x $20, or 10days x $100
If you can make the math here work for you, then buy it.
Otherwise, don't.
No.