1Dx III VS R3

[Fast Glass]

@HD

So this would be the RF 85mm f/1.2 on the R5. Wide open.

EF 85mm f/1.2 II on the 1Dx III, wide open.

Stopped down this goes away.

I would have to agree, the AF is just not quite 1-series level.

Yes it is faster on the R5 just because of the lens, the RF focuses much faster. So if you are not being particular about the accuracy i can see why someone would think it blows the 1Dx III away.

But it's all for not if the AF accuracy is not there.

What I would like to do is take a extremely fast focusing lens like the 300mm f/2.8 and 70-200mm, both with out of this world fast AF. Mount it on my 1Dx III and my friends R5. Just a gut instinct I think the auto eye detect will not always be super consistent but a fixed focus point will. And the 1Dx III will still edge it out. But I would suspect in good light both being very quick with lower light levels where the R5 will show it's weaknesses.

That's my predictions anyway without testing it yet.