A few years back I watched the Jaco Pastorius documentary "Jaco", and in it there was a really interesting interview with one of the musicians who described the few times in the mid '70's when those big three bands toured together.
He talked about the sort-of healthy rivalry between Corea and Zawinul plus that between Jaco and Stanley Clarke ( the second best bassist of the time, imo).
It makes me wish I'd been a bit older so that I could have seen them.