Camera is camera. One does have more features and you can do more things with it. High ISO and ability to crop. "Why crop? Get it right?" sure, that works for majority of situations, but working with a team, sometimes after the shoot the decision is made to use a cropped image. You don't have room for crop using Fuji, I would have to reshoot. With a 42MP, I can do so without an issue. It was never my intention to print a billboard, nor lot of pros shooting MF with 50+ to 100MP digital backs.
Fuji still isn't able to compete with high ISO against Sony. I shoot A7R II at ISO 10,000 comfortably without the fear of skin texture/color or detail loss issues compared to Fuji. Granted, I may not shoot that high of an iso often, but when you need it, it's there and it works.
With that said, If your end game is traditional portraits or landscapes that end up as 8X10,20X30 or social media, you just have to keep it in perspective that you may see all the pixels on your wonderful computer screen, but it'll only end up as 2048px on facebook and majoirity of clients are NOT going to view it in 4K or 6K like images. Not to mention your wonderful printed photo being viewed at a good distance rather than with a nose touching the print viewing every dot.
In conclusion, go out and shoot? who cares? buy both or buy all the new cameras out there?