So, a 24mm lens added to my (full frmae) video kit would allow for a wide perspective, bordering on the exaggerated. A look that if employed, I might use better in M43 to express or even the 20-60 zoom, where the softer corners may actually work in its favour if they are an issue at all.
The 24 would force either an adoption of a true wide angle as a main option, possibly used more often than I normally would, and something the zoom would do probably as well, or a forced crop to s35, just to bring it back into the realm of normal/useful and justify the cost. (24+35+50+75)
A 28mm (when it comes) would do the same but less aggressively and rather than duplicate the 50mm in s35, it would add the neutral 40mm. This would be as wide as a normal lens could go. (28+40+50+75)
A 35mm equivalent cropped to roughly C4k. This looks about right for wider and establishing shots.
The 35mm would keep everything fairly straight and visially accurate making the process invisible, but allowing for a 35-50/50-75 range between two lenses with a duplication of the 50mm. This may come in handy for either switching between two focal lengths without changing lenses or for a second camera, kind of like a two end zoom. (35+50+50+75)
Add to these premium modern lenses a clutch of 40-50-ish legacy lenses and I have tools aplenty to explore.
To me, this is the tightest and most exaggerated I would want, taken with a 90mm equivalent on M43. The kit zoom comes very close to this in s35 mode and the 50mm in crop would do it also.
A hypothetical 40mm would probably not add much to the kit that a 35/50 pair do not offer and these both have a slightly stronger effect, but if it was available first, it may have been the “one lens” option.
My thinking is the 35 would actually become my standard full frame lens with the option to crop to 50mm, the 50/75mm for tight compression, super shallow depth option with the zoom for the occasional wide and tight or establishing shot.
If I shoot full frame with a mind to crop to an Anamorphic looking 2+:1 super wide screen, then the 35 would end up being a 40-45ish lens anyway.
In a nutshell, all roads lead to a fairly conservative 35-75 range in various forms, with M43 and the kit zoom as “lungs” to explore other ideas.
The takeaway is only the anount of compression and depth rendering really matter. Coverage is more a matter of camera placement after these considerations ahave been sorted and aperture choice a final creative control.