The chrome finish on the Z fc cameras look and feel quite rough and almost "cheap" in their presentation and touch.
On the other hand the chrome finish on my FM2 in particular, and even the less well finished FM3a, is much smoother, nicely tactile and quite refined in its presentation (read "desirable").
Don't have a Z f as yet - so I at least can wait until I have both types in my hand before unzipping my wallet.
It "had" to happen -- Nikon has released a Panda version of the Zf 
I swapped my Panda Z fc for an all black model and as far as I'm concerned, the camera now looks much nicer. Thus I'm in no hurry to do anything about my black Zf...
However, opions might differ, thus let anyone enamoured by the Pandas pipe up.