Another good choice is a 50/1.8 Nikkor AF lens and any Nikon MF body that gives you some exposure control (an FG is the smallest body that has it). The 50/1.8 Nikkor, in test after test, has been competitive with Leica Summicron 50s at middle apertures.
The 40 Hexanon and 50 Nikkor are the closest you are going to get to "brutally" sharp at wide apertures. They're just "very" sharp there. One of the things that makes lenses super-expensive is being "brutally" sharp at wide apertures.
Although you can get it sometimes, I wouldn't expect "brutal sharpness" in a compact rangefinder or a p/s camera. And the Soviet stuff is going to be too hit-or-miss.