I have a friend that shoots only Zeiss glass. I have shot with him multiple times using both Nikon and Canon glass. My photographs are better than his because he sucks as a photographer. What a waste of Zeiss glass. I shoot Canon because in the mid 2000s, they had better autofocus lenses than Nikon. Now I am committed to Canon because of my lens investment. However, the next lens I buy will be a Zeiss 21mm f/2.8. From a historical perspective, Canon has always excelled in long lenses. Zeiss had better contrast (t* coating) and Leitz made great wide angle lenses. Their long lenses were lacking. At least compared to Canon. The reality is that skill and timing are often the most important deciders. I honestly believe that once in a lifetime photos depend on what you have at the time the event occurs. I shoot Canon because I had to make a choice. Since when I committed they had better af lenses. If I do not need af (21mm for example) I will buy Zeiss. I cannot afford Leica so that is not an option. Now I wish I was better at Photoshop, but I get better every time I use it and there you go...