That is sure one impressive lens from the data that Lensrentals has produced. I didn't expect it to be THAT sharp!!
Canon has in recent years really raised the bar with zoom lenses, some of those with great sharpness include:
EF-S 15-85mm f/3.5-5.6
EF 24-105mm f/4 L
EF-S 17-55mm f/2.8
EF 70-300mm f/4-5.6 L
Then it appears this lens which came out with an even more exceptional standard in terms of sharpness:
EF 70-200mm f/2.8 L mk II
and this new
EF 24-70mm f/2.8 L mk II continues (or even exceeds?!) that standard.
I had a decent copy of the 28-135mm, but at the long end it needed to be stopped down 1 EV to increase sharpness, saturation and contrast.
Well done Canon with these new lenses. It's definitely a shame for non-pros about the prices... but often one truly does get one pays for. I have the Canon 15-85mm and Canon 70-300mm L, and a bunch of other lenses. The 15-85mm and 70-300mm L that I have are both great, sharp copies. As I'm not looking to go FF at any stage soon, these 2 will do me for a long time to come!
If I was a pro with a FF, I can imagine I'd probably get the EF 24-70mm f/2.8 L zoom.... it would be great for many applications... along with a few nice 'big glass' primes!