Spees-Waler WA series vs KK Magellan WideScan III?

Has anyone compared the new Speers-waler WA 80 deg series to the Kokusai Kohki
WideScan III 84 deg. Specifically I wondering how the 18mm Speers WA vs 20mm KK
WS III and 14mm speers WA vs 13mm KK WS III. (Trying to compare similar focal
lengths) Ignoring the obvious small differences in focal lengths, AFOV, length
and
price, I'm interested in sharpness, contrast, light throughput, ability to take
in the
entire AFOV, abberations, or lack there of and specifically how it would work
in a C8
both with and without a f/6.3 focal reducer/field flattener.

Thanks,

Dan

Dan, While I have not done a direct comparison, I do own the Speers 10mm and 14mm units. The 10mm Speers eyepiece has very good edge correction while the 14mm benefits from my 1.25" paracor in my F4.5 16" dob. Both eyepieces, however, deliver excellent images given their widefield of view. I haven't used the 18mm Speers but it appears to have poor reviews due to aberrations such as astigmatism. I would not purchase the 18mm unit for use in my fast dobs. I think the best corrected eyepieces I have used are the moderate to low focal length pentax XL eyepieces which have no distortion in my F4.5 dob despite their 65 degree apparent field of view.