The 24MP images were scaled (bicubic smoother) to match the 42MP of the Sony so that any differences would be obvious. Identical sharpening was added in RAW conversion on output. This represents a 200% view.
So resolution wise I see A7rII>M10>A9. The M10 seems to have absolutely no AA filter and is prone to a little moire, but it’s easily fixable in ACR/Lightroom. However it's coming amazingly close to the rII with nearly 2x the photosites. The rII seems to have a weak AA filter, so moire is visible only in extreme blow ups but also easily fixable. The A9 seems to have a moderate AA filter and is the lowest resolution, but no Moire at all.
The Leica seems like the cleanest of the three, although the noise is minimal on all of them.
Full frame for reference...