It makes me love my OM-1 even more.
As I say, not too scientific, and here's the thing - when you hold the actual prints in your hand rather than look at the scans, although you can still see the resolution of the Retina seems to go a little further than the OM, the print from the OM looks "better" because I think the lens has slightly more natural contrast. Apart from the Werra which is noticeably not quite up there, the other three are virtually impossible to separate.

I'm not really too bothered about "tests" usually, - I really wanted to try out the old Neofin I had inherited, but didn't want to risk it on "real" images, so thought a "test" would be a good way of seeing if it worked!