Originally posted by JHfwp Pentax has certainly nailed the coatings with their DA limiteds. The FA's aren't too shabby though, just different.
I wonder how my 10-20 compares to the DA 21. LOL, probably not so well. Maybe someday...
i cant find my images that i made... but, i had a thread up about this about a year ago.
the sigma 10-20 compares very favorably against the DA21, in fact, @ 20mm i observed less barrel distortion in the sigma, and greater corner sharpness.
given the cost (at the time), the only advantage the DA had was size, but with the sigma atleast i got the 10-19.9mm range thrown in the mix.