While I don't have wild splendens (true ones are considered rather rare now as most are hybrids), I do have some other species of wild bettas.
Essentially once tame, wild-caught bettas have basically the same personality as their domesticated cousin. They just tend to be more easily spooked and more prone to jumping out and making fish crispies of themselves.
Here's a picture of a Betta livida, which belongs to my favourite complex of wild betta species. He is also a camera hog so easier to get a good shot of than some of my others.
Here's him challenging my tussyae male