recently picked up a used 24mm f/1.4L (version 1) and I'm getting this weird blur on the corners, with both my 1.3x crop cameras. Is this typical of this lens?
Not even remotely, it looks like a lens element has become displaced. Send it to Canon, it might not be prohibitively expensive if they don't need to replace elements
I had elements drift out of whack on a 70-200L after running a couple blocks with the darn thang on a strap. The left side became really blurry. I assume the running caused something to come loose inside. Took it to Canon Hawaii and they aligned it and it was tack sharp 10 days later.