I recently added the Kyocera 7135 to the list of devices. One person posted their benchmarks. If you would like to see the stats or better yet contribute to the data, please visit: http://heller.ca/cardspeed
The 7135 does not seem to have good transfer rates to the card, but I would like to validate this with more data.
You are correct. The 7135 has a slow SD port. Using a high speed SD card does help, however. See my VFSMark thread for more information -> Post your VFSMark results from your 7135.