I agree, the specs on the 90D are a nice upgrade for any crop-frame shooter (the decision to nix 24P is bizarre though)
Lately, I've been tempted to pick up a 5Ds. The price keeps dropping with the rumored high-res EOS R mirrorless on the way.
My main reason for acquiring it would actually be for digitizing film. I see more and more film shooters moving to a macro lens + DSLR on a copy stand for digitizing negatives instead of using a dedicated flatbed scanner (example vid
). I particularly struggle with color-correcting color negative film scans, I have a hard time matching colors between images for a consistent look. There is a plug-in for light room, Negative Lab Pro
, that takes a lot of the guesswork out of the color-correction process and delivers accurate results. Negative Pro is designed to work with best with RAW digital photos.
I'd want a 5Ds so I can scan a medium format image in one frame quickly. The 8688 x 5792 px sensor is about the same dimensions that I scan a 6x9 medium format negative at. Most people use lower resolution cameras and take multiple shots of sections of the medium format negative and then stitch them together, which works fine, but complicates the workflow. Also, with the 5Ds I could probably scan a roll of 120 film in a fraction of a time it takes me with a flatbed scanner.
It would also work really well as a main body for me given the main subject matter that I shoot (architecture and landscape). I was also surprised to learn that it actually has a slightly faster continuous shutter speed than my 6D! (5 fps vs. 4.5, though I'm not much of an action photographer so it doesn't really matter)