The end of 2018 saw Canon and Nikon introduce their first full-frame mirrorless cameras, with Panasonic on the verge of joining the party. This brought an end to Sony’s five-year term as sole mainstream purveyor of this type of camera and set out each company’s post-DSLR ambitions.

In July of 2019, we looked at three of those cameras and concluded the a7 III was the strongest all-rounder: the model that was pretty good at everything. However, despite the five-year head start, it was a far from universal or emphatic victory.
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https://www.dpreview.com/articles/8695762793/full-frame-mirrorless-compared-z6-vs-s1-vs-eos-r-vs-a7-iii