I still haven't had the chance to properly use the MS Optical 73/1.5, but I have tested it out in the house at various apertures. I don't see any focus shifting through f/8, though Miyazaki-san's accompanying data sheet (mostly in Japanese with some English annotation) seems to say there should be a small amount of backfocus upon stopping down. It may be small enough to be covered by DOF.
At f/2 the lens performs very similarly to my 1990 (pre-ASPH) 90mm Summicron at the same aperture. From memory, not much different to a 75mm Summilux resolution-wise (though different color & contrast signatures) but at half the size and less than half the weight.
-Dave-