Agree with a lot of the comments above, but I DO think people would "see" the difference between the old Duals and the current field dogs if they STOOD them side by side. Coats seemed to be much better on those old classics. I would venture to guess they were shorter coupled than most field dogs out there today too. Coats can be tough enough to change, but long loined dogs are VERY tough, ime, to change. Front assemblies tend to be quite straight currently in the field lines.
I wish there were more standing photos taken of todays' FCs instead of the more classic sit w/ bird in mouth photos. There is more to the equation than the head when it comes to looks. Don't get me wrong, I am not saying I like the other extreme end of the show labs either... I'm one of those breeders wanting to stay in the middle of the spectrum.