Huh. Great match. Boyka is one of the best ring fighters you could get for h2h combat. On the other hand Martin's feats borders on the cartoonish.
For now I'd lean on Boyka, simply because he's gone up against skilled opponents 1 on 1 whereas I don't recall Martin going up against skilled opponents. Martin's best feats where him beating the crap out of multiple opponents.
Martin was going up against near superhuman opponents
YouTube video
YouTube video
Note how he was getting punched literally across the room and through concrete walls, but still was overcoming his opponents. IDK if Boyka's ever taken on anybody that strong or durable.
Martin.
Again, dude is the live-action equivalent of a cartoon character who never loses so his feats are ridiculous. Boyka, as someone said above, is a ring fighter. Martin is somewhat of a an assassin(although not really by trade). He kills his opponents with ease. Both guys are similar in their flashiness but I'm going with Martin.