Digging up my own thread here but I want to ask a specific question.

Presently I have the 28 f/2.8, 50 f/1.4, 100 f/2.8 and 35-105 f/3.5. All "New" FD mount. I'm looking to buy the 35 f/2 right now and I have a chance to get the New FD version at a really good price. Is there any reason to prefer the older versions over the latest one? It will be used on a T90 as that will be my only FD body.

In the future I will look to replace the 28 f/2.8 with the f/2 version and potentially the 100 with the f/2 version as well.