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I think that, with 2.39 aspect ratios, the vertical guide lines are more important to know than the horizontal. The horizontal rule of thirds lines are pretty easy to approximate on the spot and even then the shot can be more successful if they're a bit off. But the vertical rule of thirds lines and the longest golden ratio line (the one going through the brim of Joker's hat in OP's pic) are more often than not the better places to put an object. I'm not advising to default to those, but being familiar with where they are and trying them out may be just what a shot needs.
But really, it all comes to balance, and guidelines are nothing but suggestions. If you have to move a figure away from the golden ratio line to make it more balanced, then do it. The lines aren't more right than you are, so don't enforce them.
