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I have an EOS R and its a great camera. I also have a Sony A7riii which is also a great camera. I like them both. The EOS R is a tad noisier than the Sony overall but the Sony has some issues. One is red/blue speckle noise in long exposure shadows of nightscapes. Photoshop dust and scratches filter cleans it up though.
Sony also does RAW hot pixel filtering and it turns tracked images faint stars green. Colour info is lost. That's the worst of it.
Both Sony and Canon apparently use some sort of IR light internally. The Sony for shutter timing. Perhaps the EOS R does it for the same reason.
Canon will have to either shield the ESO Ra sensor from the internal IR or use a filter that allows Ha but not the IR.
The EOS R gets the way better star colour than the Sony but really they are both good. Canon is more ergonomic for nightscapes than the Sony.
EOS R natively seems to have fairly decent Ha response as does the Sony A7iii.
Greg.
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