Nothing wrong with the J-8.
The J-12 (35/2.8) is excellent. The 85/2.8 (J-11? I can never remember) is also good although some samples are better than others.
The Zorki 4 is one of my favourite Soviet shooters. I'm not sure why. I vastly prefer my 4 to my 4K, even though the 4K has a lever wind mechanism. I prefer the knob.