quite frankly while I love my Blad glass, I am also very happy with my Nikkor glass. can't see me running out to put Zeiss lenses on my Nikon.
I was leafing thru a large hardback book put out by Life magazine featuring all their photographers. The photos were stunning in many cases. Most of them were made using lenses that today would be scoffed at. Just goes to show, at least to me anyway, what the priority should be. Great content, good composition and proper exposure.