You're welcome.I'm a strong disliker of the 28mm focal length, so would go for the 25mm (and wish it were actually a 24mm!).
Thanks for the images David! Really helpful, and make me feel better about the Batis' rendering, although it still isn't perfect for my tastes.
---Michael
I was looking at the three images after reading John's comments and noticed something interesting about the field of view.
The Batis image shows more on all sides than the 24mm Canon. I'm basing this on the fact that I can see more of specific flower or stem elements on each edge. Not sure why. The Canon lens front element, given its size and the need for an adapter, was a bit closer to the scene. Not sure that was sufficient to create the difference in field of view.
I guess the best test would be to use a focus rail on the tripod so that the front element of each lens is at the same distance from the focus point.
I also realized after doing this that I could have included the Canon TSE 24 II, its slower but probably the sharpest of the group. If I get a change I'll do a bit more playing later this week. I'll also try to find a more appealing scene.