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ISO: Apples to apples - i.e. normalized to the same MP on screen or printed to the same size, the 5DS(R) will yield the same or BETTER results, every time, practically ever ISO setting.
Judging at 100% pixel magnification, of course, will yield unfavorable results for the 5DS(R) in very high ISOs. In "reality" - i.e. application specific output, not pixel peeping, the cameras are comparable in ISO and the 5DS(R) can get VERY notably more detail REGARDLESS of situation. If your reason to get a camera other than the 5D3 is performance at really high ISOs, the 5DS(R) is not better or worse. I would look into a used 1DX if that is the priority.
Camera shake: What you hear is again, taken out of context or not compared apples to apples. Under NO circumstance I can see ANYONE getting an image that is "tack sharp" with the 5D3 or any other DSLR, and will look shaken / muddy with the 5DS(R) at the same output size. NO WAY. Again, people are pixel peeping at 100% magnification, which is apples to oranges when talking a low 20s MP sensor and a 50MP sensor - or the equivalent 40+ MP sensors Sony produces.
Sure, you cannot extract 100% of the potential of a 36, 42 or 50MP sensor handholding it at slow shutter speeds, and this is why good IS/IBIS or whatever is available is preferable at all circumstances and a tripod is unbeatable - amd not having the horrendous shutter shock the original A7R had helps. But at the end is like comparing cars in extreme traction limited scenarios: sure, a Civic Type R might not be any faster than a vanilla Civic on ice with all-season tires, but that's it. We can engineer lots of scenarios where more BHP or more MP mean nothing, BUT, lets not lose any contact with reality.
IN PRACTICE, and for NORMALIZED output sizes, there is no real drawback from high-MP sensors as far as IQ goes. Camera shake is NOT more noticeable, high ISO performance is not notably worse. What was borderline shaken will be the same, what was borderline noisy will look the same. But when you do shoot your average image, there will be notably more detail EVERY time at EVERY ISO, and when the stars align (or you just use proper setup/tripod etc) the detail is simply in another class. And this is true regardless from lens used: you will get more detail even with meh glass, only the differences are more impressive with good glass, good camera stability (either with a tripod or OS/IS) etc, or some artificial lighting. Yes, adding flash improves perceived sharpness lots (especially if the flash exposure adds up to it being the primary light source, but even as a fill it really matters).
I did not have a 5D3, but I did have the 6D which is arguably better in all ISOs as far as "per pixel sharpness", high ISO performance and DR, and I have no complaints from the 5DSR other than the stupendously larger files - at least for layered editing. If you are just using LR with them, the situation is not that bad really, at least not with a relatively current PC. But load them into PS and add just a couple of layers / layer masks and the PSD file size is just stupendous. Waiting for things to save and open is painful even if you are using SSD as a working drive, and long term storage HDDs fill up FAST.
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