KeithBreazeal said:I'm at a crossroad here. I still have my old 7D and use it only for the extra reach. The 5D IV's 30 MP sensor should be a fair crop match- or close enough. My 5D MIII is great but not extreme cropping is out. I bought the 5DS and I'm very pleased with the quality and it goes without saying that you can crop the hell out of it.
FPS is fairly important for 50% of my work, so I was a bit disappointed that the 5D IV isn't a bit faster- 10 fps would have overjoyed me.
This is actually a very interesting question. In theory, the 5DIV will only give ~1.17 (6720/5760) more linear resolving power compared to the 5DIII. This is not much compared to the 1.6x crop factor. However, I have seen several people do actual side by side comparisons of their own or analyze online data and determine that the actual benefit of crop is much closer to 1.2x more true resolution.
Then, you have lensrentals evaluation comparing the 5DIII, 5Ds and 5DsR with different lenses. As I recall the average of the lens centers showed the 5DsR ~1.4 more resolving power than the 5DIII and the 5Ds was ~1.25 more resolving power (on average of the lenses). In theory, there should be 1.5x more resolving power.
https://www.lensrentals.com/blog/2015/06/canon-5ds-and-5ds-r-initial-resolution-tests/
So true resolving power is not always ideal. But the 5DIV might be resolving similar detail to some of the latest crop sensor cameras. I would be reasonably confident the 5DIV will provide better detail than the 7D, despite it having more "pixels on target."
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