An SLR, I wager, would make both pins look sharp except for the most excellent viewing screen around (leicaflex SL2???) but the real point is that, with a wide-open lens, both pins can look sharp in the viewfinder, but the image will show a difference.
this is why a good rangefinder is better in dim light, especially with wide-angle lenses. It may not be a defect in your slr, it may just be the way the system works.
Um, you'ld lose that bet. Just tried a facsimile of that test with my FM2.
The grind though can definitely affect the brightness.
Mark Barendt, Beaverton, OR
"We do not see things the way they are. We see things the way we are." Ana´s Nin