Um, the "ANGENIEUX LENS DESIGN" Tokina 28-70 F2.8 is the ATX PRO version with 77mm filter thread. This "(72mm front) " ATX version is the original Tokina formula, before Tokina brought the rights to the ANGENIEUX formula for their 28-70 F2.6-2.8. I can't say one is better then the other, BUT be aware that this 72mm version sells for alot less then the ANGENIEUX version on ebay.

http://nikonglass.blogspot.com/2009/11/tokina-at-x-pro-28-70mm-f26-28.html

Well, if one look at the original ANGENIEUX version, it is 77mm front, http://www.dyxum.com/lenses/detail.asp?idlens=379 vs the generally acknowledged Tokina clone, also 77mm front, http://www.dyxum.com/lenses/Tokina-AT-X-270-PRO-AF-28-70-F2.6-2.8_lens182.html They actually look kind of similar.

Whereas the 72mm front version, http://www.dyxum.com/lenses/Tokina-28-70-A-TX--2.8_lens557.html looks very different and much lighter and smaller.

Again, I am not bashing 72mm front version, I have one, I brought one since it's over US$100 less on ebay than the 77mm front Tokina ANGENIEUX clone. I have yet to find any evidence online that my own 72mm front version is suppose to be an ANGENIEUX clone; I won't mind, it'll be worth more on ebay.

Baller lenses there Ed.

I have the Pro II and been satisfied. I do see the original Angie with more contrast which I think would match better to Cosina Zeiss for folks who wanted to mate with primes.