Your definition of "correct exposure" is vague. If you mean to ETTR to the edge of blown highlight in the RAW file, then you would lose 0.4 stops of dynamic range if you shoot a Nikon D810 at ISO 100 instead of shooting at ISO 64 or ISO 32. If you mean to make the histogram of in-body playback look right then ISO 32 would cause more blown highlight and ISO 100 would give you more noise in shadow.
You are getting it upside down. Shooting an IQ280 at ISO 100 with ETTR would require you to pull down exposure in post-processing, not pushing up exposure in post-processing. It would give you the same result as of ISO 35. If you disagree, then provide evidence by means of RAW files.
Man you really have a heard time understanding what is being said here.
My definition of correct exposure is the exposure that makes the image look the way you want it to look.
Photography, for me, or at least when I am being paid good money to create images, first begins with an idea of what I want. I think it through and by the time I am ready to leave for the location, I already know how I want it to look like. I know how I am going to compose it, how I will style it, and how I will light it. I pick an ISO that will allow me to get the image I am thinking about with as little steps as possible and as little tech thinking as possible, which mean picking an ISO that exposes the images correctly, for how I want it to look.
Under or over exposing only to correct that in post is kind of working against yourself. You are increasing your workflow and decreasing your ability to assess your work on location with a client looking over your shoulder and you having to manage or worrying about a dozen other things.
The test you are describing, when it comes to working like I mentioned above, which many working pros do, means absolutely nothing.
There is no point in it.
Not to mention if you can shoot at ISO 35 and get what you are thinking about, why would you not? You always get better shadow recovery at lower ISOs. Of course Sbernthal's observation about highlights and shooting at ISO 100 is very valid too.