According to cineD, Alexa has a 1-stop increase in dynamic range over the c500ii or c300iii.
What is everybody crying about? First, what are you doing, shooting the sun all day?
Second, your audience almost certainly won’t see major differences between these cameras in properly shot scenes. If you see horrible clipping, that’s an exposure error. Or a poor creative decision. Somebody is getting fired.
Some of you think if you only had an Alexa, everything you shoot would look like roger deakins’ work. Sorry, a major reason why Alexa footage looks so good is that professionals know how to light and expose - for any camera.
This is why we use dimmers on practicals, sheers on windows, and use lighting to control levels and contrast.
The differences among arri, red, and the best Sony and canon cameras are quite small on set. Yes, currently Arri’s highlight roll off is a bit nicer and has a bit more reach in the highlights, but nothing really changes the way we shoot with any of those cameras.
The truth is most of the current top cameras look very similar - properly exposed. Sure, you can stress test some cameras to show weaknesses - arri and red included, which would struggle in extreme low light. This is why these aren’t common for run-and-gun documentaries.
If Canon produces new technologies (very possible) that ends up capturing more dynamic range than the Arri, I wouldn’t be surprised. Also, I wouldn’t consider the Arri trash for having a stop less of dynamic range.