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In analyzing the photo, it appears that due to the angle of looking upward, the focus plane cuts through the icicle and the brick wall, as would be expected. Images do not have a focused spot or in-focus region, generally, especially a rectangular one. The image plane, the lens plane and the focus plane are all involved, mathematically modelled as flat planes of infinite extent. Almost all SLR lenses have lens planes parallel to the image plane, resulting in focus planes that are parallel to those two. Note also that focus is not a binary issue, but is a question of degree, though a criterion can be applied to transform it into a binary decision.
The image at the size as shown looks reasonably in focus. Without a closer larger crop, such as the fearsome 100 % crop, it is hard to tell how much the icicle is in or out of focus. Also not given is one of the most crucial pieces of information, which focus mode was used, crucial because the image contains a moving drop that follow focus could have been tracking. Note also that f1.4 is wide open and will have the softest performance for that lens and the thinnest depth of field.
The applied focus points (red/black squares) do not always get applied exactly at the point selected.
My personal experience with 20D is that all focusing issues were due to my own operator errors.
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