They are similar in their style of play. They are both pacey attacking players, who love to run with the ball, take on defenders and beat them with skill and/or pace. Martial being a forward s a much better finisher than Ox.
As for break out seasons, having one doesn't always mean much. Ramsey had one ages ago. Having said that, all I know about Martial is from what I have seen in the premier league and I haven't been too impressed.