Love the image of the burro or donkey. Was it natural light or did you build the shot?
That is shot only in natural light, very dim, so I shot ISO 6400 (which on a 6D is still amazingly clean). Shutter speed was 1/50th. I previously had the Tamron 70-300 VC before the 70-300L, and the one area where the Tamron has the Canon beat is in the image stabilization. I am actually disappointed in the 70-300L in that regard. I find that I need to be really conscious of using proper technique at lower shutter speeds, otherwise I end up disappointed. This shot, however, looks great at full magnification. That being said, it is also only 120mm, so its not like hard core stabilization was needed.
The Canon blows the Tamron away in bokeh, however, and sharpness and color rendition are both better with the Canon. The Tamron is a surprisingly strong performer considering its very low price point.