Over the years we had a number of Canon DSLR's. While appreciating their all round capabilities we have never used them very much for landscape.
The large heavy "pro" models are somewhat difficult to carry for any length of time. The memory of taking a 1DS MkII plus 3 lenses up to the summit of a very steep sea cliff is still with me.
Canon 1DS Mk II
We have used many of the cheaper cameras as backups and usually tried them for landscape work. This has often been unsatisfactory, as up to the 500D we have generally found the images from these cameras to produce slightly soft results.
The 500D was an improvement, and seemed to have both brighter colour straight out of the camera and more bite to the images.
We liked both the 5D and 5D Mk II, and the full-frame sensor produced excellent results. The Mk II seemed like it could almost be the perfect camera, but was somewhat hampered by its noisy shadow area performance even at low ISO's.
Canon 5D Mk II
Both the 7D and 550D are the best yet in terms of all round image quality. The 18MP sensor produces excellent images at low ISO's. The 550D is also a very light camera and provided we don't carry heavy lenses is very usable as a landscape camera.
Many Landscape Photographers use Canon's as a matter of choice. One of our favourite photographers David Clapp is a long term Canon user and he gets superb results. And certainly we are pleased with the images posted here, though many needed a fair amount of work to make them representative of the reality. We are certainly very impressed with the 550D as a portable high quality camera and our somewhat ambivalent attitude may be becoming more positive. It is a camera that we have been very enthusiastic about ever since we got it.
We haven't done much testing of the 7D as a landscape camera, mainly because of the weight, but have seen nothing from the results so far that indicate that its any better than the 550D. Since for landscape work we don't need the 7D's speed and all-round responsiveness, the 550D will be fine.
So we have a mellowing attitude towards the brand in general.
Now if they would like to work on a mirrorless AF version of their old rangefinder designs with the 7D/550D sensor with some small light fast lenses..............