I have had the 645D since it was released and have made good images with it. I have no complaints regarding my 645D Images. For me the problem is that the camera's computer processing system was way under powered so preview times seem to take forever. The camera handled like a snail. I don't use the 645D since getting the 645Z several years ago. Although both cameras have great image quality at base ISO, the 645Z is useful up to nearly 3200 where the 645D has trouble above 800.The Z Camera has plenty of internal computer power so it handles well. For my hands-on experience, I think the 645D is a good camera but the 634Z is a fantastic camera!