Clearly, the advantage of the MFT 2x crop factor comes into play if you crop all, or most of your images, as is the case with me. Obviously you understand that if you crop a FF image from the R5 II - or any FF camera - to the size of the MFT image or smaller, than the OM-1's 20 MP sensor totally out-resolves any and all Canon and Nikon FF cameras, and is about the same as the R7. If you have used both the OM 150-400 and the Canon 200-800, then any comparison is a joke. Basically a top-level pro lens with a very good consumer lens. The OM lens is definitely better, in my opinion, than the excellent Rf 100-500, too. The AF subject detection and tracking is definitely on par with the original Canon R5, R6 II, and better than the R7, all of which I have used. Pre-capture is better than any Canon, FPS options are higher, and the stacked sensor has a very fast read-out speed. OM's IBIS is still as good as anything on the market. It is true that OM Systems is basically a niche company now, which is unfortunate. It is difficult, in a world where the internet influencers essentially dominate the marketing opinion of consumers, for them to compete, since we all "know" how FF is the only way to go if you are a "real" photographer.I go out birding most days and see a large number of Canons and a sprinkling of Nikons and Sonys, but not a single OM in the past few years. I occasionally saw an Olympus pre-Covid. Canon and Sony have about 70% of worldwide mirrorless sales and OM are now down to only 2-3% from higher when they were Olympus. They are more popular in Japan but have dropped behind Nikon at around the 12% mark or less.
In terms of practicality for birding, the star OM telephoto is the 150-400mm f/4.5 with the 1.25x TC, costing over £6000 here. Given the crop factor of 2, that is equivalent to an 300-800mm f/9, about the same weight as the Canon 200-800m f/9, costing £2000. Further, the OM sensor is only 20.4 Mpx, compared with 45 Mpx on an R5ii, so the R5ii has an effective extra reach of 50%, like having a built in 1.5x TC. The cheaper 32 Mpx R6iii has 32.5 Mpx, which is equivalent to having a 1.26xTC on it compared with the OM. The lighter RF 100-500mm f/7.1 has an equivalent reach of 750mm on the R5ii, compared with the OM. The cheaper M. Zuiko Digital ED 150-600mm f/5.0-6.3 IS costs £2500, weighs more than the 200-800, and is just a rebadged Sigma with a marked-up price.
As good as Olympus used to be, and it was far ahead in the past, OM haven't put in the development and so Canon has leapt ahead in terms of AF, subject identification and tracking. However, your opinion clearly differs, and there are devotees of M4/3.
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