So I finally got around to testing this lens today. Straight .jpg's.
Barrel distortion is horrendous.
You should be able to click through to see full size files.
This first one wide open. The others between f8 and f16.
DSCF3093 by Begi Nabara, on Flickr
DSCF3084 by Begi Nabara, on Flickr
DSCF3081 by Begi Nabara, on Flickr
DSCF3087 by Begi Nabara, on Flickr
DSCF3089 by Begi Nabara, on Flickr
DSCF3092 by Begi Nabara, on Flickr
Overall result: Pretty disappointing. I won't be using it again, the Zonlai is far superior.
The Kaxinda 50mm f2.4 is another matter, it's good but too long for most of my work.