A few years ago, I got the RX10iv for the "family" camera which later also became the main video camera. My family did not like to switch lenses.
Back in Fall 2018, I got the Sony A7ii for my manual glass so that I could experience the full expectation of glass that was intended to be used in that format back in the film days. Also, got the Voigtlander 10mm for the camera.
Otherwise, I was a very happy Fuji user with six Fuji cameras and 20 lenses. Last year was a sad year for me. Fuji started to make some strange decisions with their camera designs that did not work well for my needs. And then Fuji announced that they would not come out with the 33 f/1.0. So I got the Zeiss 50 f/1.4 for the A7ii and loved it but the AF with the A7ii could not match what I was used to with my Fuji gear. Having a fast normal lens was pivotal for some of my work. Dealing with a lot of low light no flash event photography the Fuji gear could do good but I noticed that the sharpness especially with my 1.x primes could be better.
Mid-January this year, I had to make a decision should I switch to more Sony gear. I did order online a used A7iii for the 50 prime and I also got a Sigma 35 f/1.4. The AF and quality of the images were stunning. I amazingly have a local camera store in my little town and so I decided to see what I could get with the gear that I realized I no longer used. I came out of the store with a used A9 with RRS L-bracket and a new 24-105 G lens. Using the camera for a few weeks I decided I should just give up with my Fuji gear. Thanks to the Sony trade-up program and the store having a used 16-35 GM, I was able to trade in the rest of the gear for several G and GM lenses (and the Tamron 28-75 for IR).
Early Spring, I got a great deal on a 590nm IR converted A7Rii and realized the joy of 42 MP images. Late Spring, I found a deal on a used A7Riii.
Due to the events of the year 2020, I still have no idea if my gear will deliver my expectations for event photography. I originally made the decision to switch back in January so that I would have three months to "know" my gear. Well, I can handle my gear in the dark for astro-photography so I at least have that.

From what I can tell it would appear that I should have a gain of one stop and considerably better sharpness but in the field is when the real test will help confirm.