I tried a year or so back on a Sony a7Rm2. It was no better than the card I was using. Reading files with my reliable Transcend card reader also gave the occasional odd result. Then I recently bought a Sony a7Rm4 camera designed for the UHS-II card and it all suddenly became obvious. The cards work as advertised but only on gear designed for them. I have also bought a UHS-II card reader, fast reads with no weird results.