Well, it’s hard to compare Fujifilm flagship cameras to anything else, for the simple reason, that Fujifilm decided to stay out of the full frame war, and focus on the advantages that other formats like APS-C and Medium Format offer.
So, inevitably, every comparison can be called “unfair”.
For example, B&H Explora said in their dedicated Canon EOS R5 comparison article, that:
there are plenty of real advantages to medium format, which is why we aren’t daring to make a comparison with the Fujiflm GFX100, but sticking with the Fujifilm GFX 50S here.
But has that ever stopped us from making unfair comparisons? I don’t think so.
So, while waiting for the first real life reviews to hit the web, and hence the first real life comparisons, down below you can find a nude and crude specs comparison between the Fujifilm X-T4, Fujifilm GFX100, Canon EOS R5 and Canon EOS R6.
If you want the megapixel master comparison, check out the following one: GFX100 vs GFX 50S vs Canon R5 vs Sony A7rIV