Best Mirrorless camera for low light

[4Bstapleton]

I am selling one of my 5D Mark IV cameras and upgrade to a mirrorless camera, mostly for the eye focus feature.  I like the idea of the r5 because of the 45 megapixels (for cropping), but I have also heard that it is not very good in low light.  I would like to know the best mirrorless camera for shooting in low light.  Example:  I was shooting a girls' basketball game with my 5D Mark IV in a gym yesterday and the fastest I could shoot was 1/500 second (f/2.8) because I had my ISO as high as I was comfortable with at ISO 10,000.

Thank you.

Bruce

[p4pictures]

To get the most sensitivity from a pixel you need the largest pixel surface area. Currently the largest pixels are found in the EOS R3, EOS R6 Mark II or EOS R8. I previously owned the EOS 5D Mark IV and in my view the EOS R6 Mark II is an improvement in low light over the EOS 5D Mark IV for high ISO noise and AF capability. 

There is not much difference between 24MP and 30MP images at all practical print sizes.

[Tronhard]

I shoot with the R5, R6 and R6II bodies fairly regularly.   As Brian, my respected colleague, says that for best low light performance the lower the pixel density the better, but I found the R5 to be better than the 5DIV, in part for it being a newer sensor, and also its tolerance to using ISO values higher than 10,000.  Really, much depends on what pixel size you need for your shooting conditions and output.   If you are shooting all but for very large, detailed prints, then the R6II might be better.   The MLC system takes a bit of getting used to so whatever you choose, spend some time with the camera before you commit it to a game.

If you want the best of both worlds, consider the R5 but also purchase a de-noising app like Topaz DeNoise AI.  It is a highly capable program that can work wonders on noisy images.   I used it to clean up a large number of degraded transparency film images from the 1980's and it was brilliant.