I had a brief indoor look with a 10x30 IS Canon today. The edge sharpness was very good, but not nearly as good as in the 10x42 IS L or the Swarovisions. There is a little bit of field curvature, so the edges of a centrally focused image could be made sharper still by focusing a bit more towards the infinity. But, even when the focus was set for optimum center sharpness, it was possible to resolve the largest patterns of the Edmund USAF card at the very edge. This was done at a distance of some 6-8 meters, don't know the exact distance.
Obviously, I cannot say anything definite about the optical construction of the eyepiece, but comparing it to other binoculars I have used with various types of eyepieces, the image looks like that of a singlet field flattener design such as those used by Nikon. The view is easy and natural, but not particularly bright.
The stabilizer engages in about a second, and stabilized very well. Bar code numbers on binocular boxes that could only be seen as numbers, but not read, with a 8x30 E II Nikon could easily and quickly be read with the Canon once the IS was depressed.
Kimmo