Custom Lens in high quality yes, using full frame or aps-c lens in front of 3x3 mm sensor? anyone thought about incredible crop factor? i dubt that inside this adapter there is a good speedbooster lens to focalize light from a full size lens on so small sensors surface.
a joke for Joker...
And don't forget that you can use only full mecha lenses, i not see controller of iris for canon lenses and nikon g series, only for mecha lenses. Not enable stabilizer that on so big lens is very very important.
If developers thought about pratical use, they should thought to s16mm lenses not to full frame lenses... less weight, most of mechanical control.

people do the difference, i used pp from 1996, resolve from 2009, fcpx from its born, after effects and other adobe procut from 1997. Certified user and trainer on many of that, and other about 3d, post, etc.

At today Resolve offer you integration of ingest, edit, color, vfx, audio, delivery that never Adobe tools offer you, be cause you must in out from software, use dinamic link that often give you errors and delays.
Offert a collaborative situation where you can in out from Resolve to many other editor and back, things that others wann't to do (to keep users locked on their suite).
If you ask me, i told you choose software that you think easy for your work, but test every single feature, be cause hidden problems are daily fight for software, and i can annoying you with a long list of problems for all of these softwares.

Davinci is not only a videoeditor, was born like Pro Color suite, then bmd add editing panel, at today, also audio Pro editing suite, and VFX with actual Fusion Tab.

there is many way to do that, you can change the opacity of node, you can stack a layer node that allow you to blend in different way the lut effect, you can do a qualifier to apply a lut only in a part of picture, and so on... Resolve had tons of tools and solution to do everything you can think about color, and more :-D

add a monitor like VA4k to your camera, check that your camera go out by hdmi or sdi with correct signal (10bit 4:2:2 uncompressed) and you can record by it.
check exactly that camera can output a clean feed to recorder, you could be surpriced from how many cameras cannot feed out a clean signal or a full signal. I use it with gh5 to record a UHD 30fps at prores 4:2:2 10 bit, clean as my blackmagic cameras.

I hope Mr Palmer start to use Premiere / After instead to do managment to see all worst changment of interface that cause a downspeed of work
1) color choose for keyframe dark blu on dark grey interface
2) many tools not thought for high res (retina / 4k) monitor that are usable, sensible areas are small and weak to click
3) too many panel that are empty be cause developers fill controls OUT of windows...
4) GPU support good and broken every release that cause instability and crash also with certified Quadro cards on workstation (both win and mac)
5) try to learn how work permission under win and mac, to avoid problems on preview when you not work a disk (or a desktop) not formatted from your users, on in a san ...
i use premiere from 20 years, some is better than in past some is embarrassing...