To get an idea of the performance increase with the X-E2 vs the X-E1, I shot high-speed burst mode using RAW to fill the image buffer and then timed the release.  Since the X-E2 uses 14-bit RAW files and the X-E1 uses 12-bit RAW files, the X-E2 files are larger, but the X-E1 can handle a few more photos in burst mode before filling.  The X-E2′s RAWs are 30% larger (32.2MB vs 24.9MB) than the X-E1s, while the X-E1 can shoot 11 frames  vs the X-E2′s 8 frames before filling the buffer…  Total write size in the buffer is approximately the same, though the X-E1 is writing 6% more data…if write speeds are equal, we’d expect a 6% performance improvement on the X-E2. The third column in the table below are extrapolated times based on this difference.  I think both share an approximately 280MB buffer. I also tested three different SD cards.  First, a SanDisk Ultra, “Class 10″ 15MB/sec card; Second, a SanDisk Extreme UHS-1, 45MB/sec card; Finally, a PNY Elite Pro UHS-1, 90MB/sec card.

Here are the results:

Times required to clear image buffer after high-speed RAW image burst

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Fuji X-E1 Fuji X-E2 Jordan Steele write performance