I have finally upgraded to Lollipop on my trusty and tiny Xperia Ray and all is great. However since everything is pretty much run out of the SD card now, my SanDisk Ultra is feeling the pain. So I need a faster card, particularly in the 4K read score. I see some of the newer cards can do up to 90MB/s on seq reads and 8MB/s on 4K. Any particular recommendations from people?