They all look very similar, I have to say. I am guessing here: 100MP, 105, 70-200.
The first shot gives a greater overall impression of sharpness, especially in the skin, but part of this is because the sharp region spans nosetips to eyeballs, whereas in the second and third shot, the sharp region goes from eyeball to sideburns.
The second shot is nearly as sharp, but something about the way it renders the skin feels a little softer. The third shot just fails to be critically sharp anywhere, but it has a really nice look in the background, a little softer than the other two.
For your next test, it would be great if you could go to the minimum distance of the 105. Also, a future test with harsh light might be educational. I like the 105 very much, but it isn't as good a lens as recent top lenses, I am pretty sure. I may also be able to contribute something at some point. I am planning on picking up the 100MP soon.