I know a lot of people who do multiple martial arts. My boyfriend's first black belt was in karate, but now he has it in Judo and is almost there in ju jitsu.
As far as the tournaments go - it will depend on all the same things that every other tournament depends on - technique, conditioning, etc.
I can't imagine training in other arts will help you very much if you haven't trained in Karate. Having competed before in other arts might - just because you already know how it feels to step up to the mats, etc.
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