Excellent report Steve! You answered all my questions and more
Anyway the KK Widescan III 20mm came in last Wed and I had a chance to try it out under Ron's (Astro Ron) dark skies. The ep would not focus in my C6 (not enough focus travel) so I had to test it out in Andrew's (astro_south's) 12.5" f/6 dob. Very good across the entire field with maybe the last 1/4 of the field going soft. Eye relieve is okay although I need to move my eyeball around to take in the whole field so I guess it is less than 15mm er. Last night I had it tested in my Orion 80ST. Essentially the same performance as in Andrew's scope. Have not had a chance to test for flaring yet though.....anyway...
Darren