Hmm... interesting... I wished for a new consumer prime in the 24-28mm range from Canon but I thought more about something in the lines of f/1.4-2.0, maybe even as an EF-S lens. Now we get these two lenses and I don't know what to think of them. f/2.8 is putting me off but image stabilization, FF and the fact that these lenses look pretty light and compact makes things interesting again, especially if the price is right and the lenses are sharp wide open.
Looks like no weather sealing, very disappointingCanon wants you to buy the 24L, simple as that.
In an area where annual rainfall is measured in meters this is more important than IS.
In one of the other threads, it was mentioned that these images look like renderings rather than product images taken with a camera.These look like normal product shots to me, in line with other product shots we've seen from Canon so far.
Given the various reflection details, etc, I think that explains why the images of the two lenses look so alike. It would be virtually impossible to recreate the same lighting, reflections, etc, on two objects that aren't identical,.