Have most now forsaken the 5dMk3 and jumped on to the Mk4?

For people like me--primarily but not exclusively landscape shooters--it was the 5D3 that wasn't worth the upgrade price, because although autofocus and high-ISO performance were significantly upgraded, image quality was no better shooting relatively static subjects, and sensor-technology/dynamic range issues were not addressed. But I can see that for many types of photography you could say the same regarding the 5D3 vs. the 5D4. And I would imagine that for video shooters the crop 4K of the 5D4 is a step backward in many situations.
In short, for photographers doing other kinds of work the upgrades of the 5D4 over the 5D3 no doubt equally fail to justify the price tag.

But with the 5D4 I get the autofocus/high-ISO upgrades of the 5D3--with a couple of cherries on top--including the wider distribution and increased sensitivity of AF points. And I get the improved resolution and a two-stop bump in DR that often are useful in landscape work. For 5D2 holdouts like me, I can say with assurance that the cumulative improvements of the past eight years make the 5D4 an almost compulsory upgrade. I am constantly thrilled by the ergonomic refinements of the 5D4. (You can get used to the intuitive shortcuts provide by that touch screen in a New York minute.) And the improvements in image quality--especially under more trying conditions--are palpable as well. If you're at 5D2 and holding, trust me, the only questions about the 5D4 are budgetary.
 
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Having shot with both cameras more extensively (as well as the 5DSR), the improvements of the 4 over the 3 are more "nice to have" than anything else. If I had even a slightly tighter budget I would have definitely skipped. The bump in resolution is nice as well, but thing is, if I REALLY want resolution, I'll pick up the R.

I think for me, the most noticeable benefit has come from indoor available light shooting - in general the 5D4 files clean up just a bit better than the 3, reminding me more of the 6D I used to have prior. However, the 3 still has great output and I still make use of it from time to time. This is the R's biggest weakness by far. And I've seem to have done a LOT of this type of shooting lately...

Especially after testing the new M5 today inside the store, it's clear how much better the FF cameras are - even the older ones! - in handling indoor environments.
 
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