As I played around with manual focusing this week using my Canon and Tamron lenses, there was day and night difference between my lens's autofocus accuracy and my manual inaccuracy. This made me realize more than ever the advancements and technology of Canon, Nikon, Tamron and Sigma.
The manual focus was a self-test to see whether I should buy a Zeiss 100mm Milvus that I began to covet. Not just macro, but portraits too. Undeniably, Zeiss has beautiful glass, some of the best. But I realized how handicapped the Zeiss "package" would be to me. If compared to walking, it would be like dislocating one of my knees.
Then it hit me just how advanced the "packages" of Canon, Nikon and Sigma have become. If all that the others had to do all day was work on manual glass, I suppose all of them could match Zeiss molecule for molecule.
I would enjoy owning a Zeiss, but not buying one. Now to those who somehow manage to manually focus easily and accurately for portraits or weddings, I'll applaud you're getting more of your money's worth.
They don't PWN Zeiss' potential image quality ... just the overall package. Sort of like Triathlon champs.