I've recently noticed that it looks like the support for OpenCL looks like being slowly dropped in favor of using Vulkan (although it might be only in game industry, as I assume OpenCL is still used in places where rendering is not going to be the thing),
Agree, but even for non rendering tasks Compute Shader will be preferred because you can do both async if you use Graphics API for everything.
Also NVidias lack of support makes OpenCL inpractical because 1.2 has no indirect dispatch.
I do a large project in OpenCL and Vulkan (to get some profiler data - CodeXL does not work yet for Vulkan).
Ignoring the dispatch problem and looking only at GPU time and AMD, the performance varies about 20-30%. Sometimes VK wins, sometimes OpenCL.
Next Vulkan will have data sharing, so personally i'm still considering OpenCL as an alternative in extreme cases.