ThorstenMUC

For Video-Conference by prio (imho)
1) get proper audio - weather you buy a decent headset with noise-canceling mic or a USB-mic - good quality, noise-free audio is important

2) light - light your...

@SteveAnderson - if you are talking about the Tamron 28-75 f/2.8 Macro... this is a budget lens designed in film-era and it still seems to do well on the 5Dm2 sensor...
Expecting much more modern,...

With BSI the low light capability almost completely unrelated to pixel-density.
The lens (T-stop) and the sensor-size & technology is the only thing that matters.

That said - the increased...

1st Fuji can make any contract with Sony Imaging as they want... even exclusivity for a sensor if they want... they just need to pay for it.

2nd Fujifilm may still have better access to Sony...

And I still like to keep (my) rumor alive, that Sony indirectly aquired Fujifilms sensor-development and still sources materials for their sensors from Fujifilm today...
So there may be long-year...

You are most definately using Adobe RAW with sharpening-settings inappropriate for X-Trans. There are tutorials for years now, how to not produce these wormy effect - even when using Adobe.

you forget you need lenses... If you want to make use of the additional quality a bigger-sensor could offer you - you need the high-end fullframe lenses... and that won't be cheap.

This is the video-tailored hybrid-camera... there is an X-H2 incoming with higher-res sensor (8k)... and most probably an X-T5 with one of the sensors next year...

X-H2 should have it - though 6k's 18MP should be sufficient most of the times imho.