Canon 1Dx Mark III has a dynamic range of 14.5Evs if we believe the DXO tests. Sony A9 II has a dynamic range of 14Evs. Nikon D5 has a dynamic range of 12.3Evs. The results for Nikon D6 aren't yet published. Pentax K1 has a dynamic range of 14.6Evs.
From what I understood, Canon R6 has a similar sensor as 1Dx Mark III so the dynamic range should be similar. R5 has also a new sensor and it seems to be a good one from what people who spent some time with the camera said about the dynamic range.
---------- Post added 07-12-20 at 12:42 PM ----------
Originally posted by Serkevan Yeah, we tend to compare and complain about sensors having less DR but the reality is that most of us wouldn't even max a Canon APS-C sensor out 90% of the time. We're splitting hairs between "great" and "impressive"... anyone who isn't particularly into the gear aspects as much as the art aspects of photography isn't going to fret about the sensor's technicalities or how many lines/mm a given prime manages on the last pixel of the corners, but might put a lot of attention to the rendering of the lenses, the base colours the camera produces, and the ergonomics. I know for a fact that my ex doesn't give a flying about how many EVs of DR or how many fps her 6D has, but you'll have to take her 24-70/4L and 70-200/4L off of her cold dead hands.
In this day and age, I don't really think you can go "wrong" with any camera brand. All of them produce excellent gear.
I'm one of the people who doesn't care at all about the dynamic range. I was satisfied with the dynamic range of all my cameras, started with Olympus Pen and continuing with Pentax K5 II, Pentax K3 II, Canon 6D, Canon 5D Mark IV and Canon EOS R. Except landscapes which I don't like to shoot, I've shot a lot of subjects, from BIF, portraits, events, macro, sports and I haven't had any problem with dynamic range.
Even for landscapes, I didn't had any kind of problem with dynamic range because I used filters or bracket shots.