The best FF sensors (Sonny) will outperform the best MFT sensors in
measurements. The physics of 4X area with more overall signal will eventually
trump the gains in engineering especially as one pushes up the ISO.
https://www.dxomark.com/Cameras/Compare/Side-by-side/Sony-A7R-II-versus-Olympus-OM-D-E-M5-Mark-II___1035_1006
Whether that matters for moderate sized prints or web images is another story.
If one likes astro-landscapes with high DR at high ISO then A7RII is way to
go. Sonny is still ahead of Canyon on this.
All is not sweetness on light for this cam as the sensor does run hot and the
A7r may be better for long exposures. One can also use HDR and multishot
high-resolution modes on Oly MFT to make up the difference for static subjects.
Mike
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