I use a Moskva 5 and mine is very sharp, even pretty decent at f5.6, with good contrast. The RF is spot on, as are the shutter speeds it would seem.

Mine's not the most pristine example, and has had its double exposure prevention mechanism removed, but then it only cost $20. It is not the easiest thing in the world to handhold, but a bit of practice makes it easier. It is easier to handhold vertically.