Thats pretty good for 3200. I never got shots with this low grain/ noise on 3200 on my 5dc...
Did you nail your exposure's?
Also, the larger the format of film, the less critical it is of the lens you put in front of it.
I think I did... infact I was looking at some of my older shots and I have visible grain in the well exposed areas (100% views ofcourse) at ISO 640... I deleted a bunch of older stuff yesterday and I saw one that showed this phenomenon. I don't think I had a defective body... it took amazing shots at below 400 ISO.
I just expected it to trounce the T2i in 1600-3200, and it did not seem to do so...
I did love the Viewfinder though compared to the T2i. I like the Auto ISO on the T2i, makes shooting on the go so much easier.
Do you have any examples of excessive noise @ 640?