Ok, I guess that's enough fun .. :-)
The comparison photos line up like this:
The raw files coming out of the two cameras are very different processed to Lightroom's defaults, both in white balance (AWB) and overall contrast, as you can (hopefully) see from the unprocessed raw files in these pair strips:
Top row is Leica M9, bottom is Sony A7, in both sets of five frames.
That would have made it too easy to guess which camera made which image for anyone who was familiar with processing raw files from either. So I took a few minutes time to adjust the white balance, contrast, and exposure so that they had a similar feel.
What I didn't do was any changes to lens characteristics, other than turning on LaCA removal for all exposures from both cameras. The thing to look for (as one person commented) was that the M-Rokkor 40 at f/4.7 on the A7 would produce slightly darkened corners compared to the M9 at the same lens opening. The other indicator (which several people commented on) was that the M9 produces very vivid greens which are difficult to match with the standard camera calibration profiles provided by Lightroom for the two cameras.
If I create a custom camera profile for both with Xrite Passport software and a color checker, the resulting colors are virtually indistinguishable.. This is why I've always maintained that using the colors produced by the CCD sensor in the Leica as a proof of its so-called superiority is hogwash. The color spec is far more influenced by calibration and image processing than by the technology of the sensor.
Sharpness was not a good discriminator. Even if you had the full resolution images to work with, all of these photos were made hand-held. It would be impossible to say with any credibility that one camera out-performed the other based upon resolution potential given the same lens and this test.
So which camera wins for me?
Well, it's a mixed bag. Neither camera is perfect, each has advantages and disadvantages. And I like shooting with both of them. I can afford to keep both if I want to. But I know that I'll get more use out of the Sony due to its viewfinder, greater sensitivity, and lens versatility. And I know that I will likely not be able to afford buying comparable quality lenses for the M9 across the board like I have for the A7. I feel the overall imaging performance is close enough to a wash that that's not a consideration.
A fun comparison. :-)