Found this Flickr set with some really good examples in larger resolution:
Along with his review:
Some key notes:
"Huge improvements in edge sharpness. Shooting this lens wide open was a bit of a surprise just how well it worked. But also with the 5Dmk3 and its superior auto focus, it is amazing how fast and well it locks on. I've been struggling to get my F/1.4 lenses to be this good. I will admit that those issues are my fault, but with this lens, I have yet to use it wrong. It's bomb proof, but it's also depth of field proof. When I say that, I mean that in the lightest remarks in that the shallower the depth of field, the more likely a person will make focusing errors (and blame the camera for it)."
"The images do appear sharper than my 24mm prime which would match the Imatest results that Roger Cicala found over the 24mm T-SE which has similar properties and considered the sharpest prime. This certainly has made me happy with my decision."
"Focus speed seems faster than the older 24-70, however I have no way to confirm that at this moment (I'll revisit this when I can). But I am going to assume that it is likely faster with the 5Dmk3 as the current generation of lenses that use the new AF technology in the 2012 generation of cameras. Focusing in low light is easy. I tested some focus acquisitions in .3 EV of light and it hunted for a little, but nailed the focus after a couple of seconds which is very impressive. For event shooting where you want to freeze the action or capture the moment, this lens will not disappoint."