The only problem I had with the Canon when using it outdoors at close focus distances of 2 ft or less was that it took a long time to settle on the focus. This resulted in a lot of out of focus images from me impatently pressing the shutter too soon. Its the same or worse of Tamron and sigma, the point is, be patient and use a tripod if you can. The lens is very sharp if you don't be impatient like me.
Here is a heavily cropped image I took with the lens (handheld). The image was a jpeg, so its old. I have only used RAW in recent years.