You can use the same high res hdr/exr for everything, just by placing your high res hdr/ext in the dome light proper slot. Since vray has the dome light, you don’t have to use old methods like bluring a low res hdr for lighting and using the high res for background and reflections. So, when I’m rendering to a 4k output, I use at least a 16k hdr/exr image for nice and sharp background and reflections.
You have to think that a 16k hdr/exr will be applyed to your scene all around your sky hemisfere, meaning it will be wrapped around a semi sphere in 360 degrees. I’ ve found that using 16k+ hdr/exr images, gives me nice and sharp background image and reflections if I’m rendering in 4k. Personally, I just throw whatever hdri Peter Guthrie sends me into the vray dome light and roll with it.(not even sure what resolution those things are.) I'm not saying all this is correct, more of me just thinking out loud along with you. The important thing is making sure you have all the exposure brackets in the hdri, which is what actually makes it a true high dynamic range image, rather than super-high resolution. But, I wanna say with all the improvements to vray over the last 5-6 years that you don't have to do this anymore.(I personally haven't done it in years, but I've moved from quality to speed/quantity of the past few years.) I'm not really sure if you need that high resolution anyway, if your final render is only going to be 4-8K, right? It may depend on whether you are doing some interior where you'll see high quality reflections up close, or doing far away exterior shots. In the old days you would blur a low res version of the hdri for GI, then set up the high-res in the reflection override slot for your final render. This would be worth doing some tests to compare different resolution's results for environment & reflections.
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