The old F mount lenses were generally soft wide open compared to modern lenses, mostly due to the limitations of the F mount. The Z mount has changed that line of thinking. The new iterations of fast lenses in the Z mount have all been very sharp wide open look at the 50 f1.8, 85 f1.8. You may think sharpness is overrated, but most like the ability to have a sharp lens wide open. You can always add softness in post, you cannot add sharpness. I just don't see the real appeal of this lens over the f1.8 version other than price. As I said, it is possibly more a videocentric lens.
People doing video are in cases using older lenses for certain effects, its also that if their making a movie or film clip that is retro, some want the outcome to be fitting for the period.
Today there are so many super sharp lenses that in many cases actually boarder on being to clinical therefore not engaging.
You watch some TV series and the film looks ok but every person has bleeding sharp eyes that actually look alien.
A show with queen Victoria in amazing gown with her maids, the story is set in an a period yet the cast all have alien eyes because i assume the editing or tracking software has made it that way, terrible actually.
Wedding photos ultra-sharp are not pleasing so some say.
I think your view on the lens being video-centric makes sense so far.
When you look at it you have several levels of optic choices emerging, that could be for specific purpose, versatility of use or price, regardless they are great options.
In the Lab the 35mm 1.4 G doesn't rate as good or sharp wide open technically as the 1.8 s because of CA and some other artifacts, but the G it did seem to have a nicer bokah.
There all just tools.
MTF charts, are just a technical measurement tool or means to quickly establish the light gathering capabilities or over all lens optimum performance capabilities that fit the purpose without having to go out and do extensive trials first.
MTF charts shows me quickly that the 16-35 is 20% sharper in the centre compared to the 14-24 yet the 14-24 is sharp to edges and gathers more light, this is all from reading a simple chart, so before i even buy or rent a lens i check the MTF charts, noted the public may be less likely to and would rely possibly more on Face Book or internet posts.
Is this the start of 3 levels of products, does this mean there may well be 3 levels of cameras ????
What this 35mm 1.4 is about will be understood over time, i guess.
Only an opinion