...

My only curiosity, and yeah I know orders of significance etc...

Buuuuut I wonder why they didn't consider a Z5[0][1] and the Z mount 14-24, or the Z5 with an adapter for the F mount 14-24....

There's at least a pound of weight savings on the table.

Specifically, I wonder if it's a fun reason? i.e. it would be interesting if there was a technical reason like 'IBIS fails miserbly' or 'increased sensor resolution adds too much noise' (even at that ISO you gave from the EXIF...)

[0] I'm really more of a Sony person but am thus keenly aware about importance of UX feel, so I tried to keep the question apples to apples here.

Edited to add:

[1] Per [0] I may be stupid in thinking the Z5 is a 'at least minimal' substitute so happy to learn something here.