I only see the 3dmark benchmarking app for PC etc but nothing for mac. I do have geek bench pro but wondering if any mac apps exist to test your readiness for 4k video or gaming and also perhaps VR. Xbench looks very old. Im trying to test my cMP.
Oculus have said that there is no official Apple product that is powerful enough to run VR. There are plenty of other, newer benchmarks such as Unigine Heaven/Valley. Take a look at barefeats.com for other examples of what people are using to measure performance these days.
For 4K video, simply download some 4K video sample and play it. It doesn't matter if your screen is 4K or not. As long as you can play it smoothly, the system is ready for 4K video (at least up to that bit rate on that particular coding).
For 4K gaming, you can use Unigine Valley / Heaven. Manual set the resolution to 4K (may require a 4K monitor), and run it.