Better than the first movie.
Fights, drama and humour are well balanced in this sequel compared to the original in which there was few action and more drama.
Plot is more articulated and original, thanks to the setting too (the russian prison is way more interesting than the generic US prison of the first film)
Characters are way better, more interesting and charismatic. Maybe Chambers is portrayed too much as a good guy in this sequel, and the morality is less blurred and more defined, with Chambers as the innocent victim who fights for a good cause and Bokya and the russian mob as the evil guys. Also the ending is too sentimental for an action film.
Some memorable scenes, like the one with Chambers outside in the snow.
Fights are great with good choreographies and direction. The only flaw is the shortness of the final fight, i would have preferred a longer and suspanseful duel.