I looked at some of you work from safari. Not all the images where stored with the EXIF data. You might be better served starting a separate discussion on (a) low-light technique and (b) high ISO processing. Your observation about the same sensor is spot on, the 1 to 1 results should be similar, if not indistinguishable between the cameras. I did a sort by ISO in my LR catalog for comparables, but I don't have anything in 2019 / 2020 that really matches based on light and distance looking at your results. You might consider another separate thread based on your dog running results where AF tuning ideas (or limitations) specific to the EOS R might be discussed.

Thank you for this. It’s also good to hear the 1DXII is as good as you say it is! I just can’t justify a 7k camera with the 1Dx III to take dog photos 90% of the time, but what I DO want is something that works well. This is just getting frustrating that the EOS R is just incredibly noisy in the slightest shade. I expose to the right as much as I can, but my lighting situations usually cause a flat histogram and I just have to deal with it or I’d blow out all of the highlights. I’d prefer CLEAR images where the subject isn’t smoothed out too much due to constant “denoising”.

I LOVE the EOS R in daytime. But with this lower light noise, the pretty bad tracking, and the autofocus that is lightening fast on the first frame, but can’t keep up, is just not what I thought I was getting with this camera.

I’ve got the Tamron 150-600 G2
Canon 70-200 F/2.8 USM III
Canon RF 24-105
Canon 2.8L 100mm macro
Just to name a few, and the results are consistent with all of them. I think I am close to making a jump to either the 5D mark IV or the IDX as a second body to eventually sell my EOS R, but it’s a really tough decision because in comparisons; the 5D mark IV vs the EOS R are basically the same in most categories, which makes me lean towards and IDX OR, wait until the new mirrorless comes out. Tough decisions, but when all I really want to do is wander around and photograph things, it’s discouraging to have to deal with so much noise.

I think you would do well with the newer 1DX series. Even though I shoot Olympus now, I have shot with Canon at one time. It is a good system and I suspect that the larger pixel size on the 1DX might help solve the noise problem you are seeing. If you are not making a lot of larger than 30X40 prints, it probably will sever you well. I know my 20MP Olympus E-M1 mkII serves me very well and it would have more problems with noise than the 1DX series would. As worst case, rent a 1DX and put it to the test of your photography.

I have been photographing with a Canon 80D for about 4 years, mainly birds in flight, and got the itch to upgrade. I ordered a Canon 90D from B&H and used it for about a month. I had nothing but problems with getting focus on birds in flight. Did all kinds of changes to the custom settings, but didn’t help. I went to the Canon 90D Facebook page and there were countless postings of people having problems with focusing on birds in flight. I returned the 90D to B&H and order the 5D MKIV. I have been using the MK IV for about 2 weeks now and LOVE this camera.