Thanks a lot.
So 47MB/s sequential and 15MB/s write. That means you can copy a movie from the tablet to a USB2 disk at max speed and copy from the disk to the tablet at like 60% speed.
As a reference, here is Anantech's latest benchmarks on other devices. It is the Note 3 review just skip to the NAND section.
An USB2.0 disk will yield about 25MB/s sequential, a cheap old internal PC HDD is about 90MB/s (both write and read though) and a real SSD between 150MB/s on SATA 2 up to 450ish on SATA3. IOPS are another matter of course.
I like this tablet but I think I will wait for a tablet with faster eMMC and faster WIFI (ac). Maybe next model.
Thanks for your input.