While 650 is lower than the 707 horses corralled by the Dodge Challenger Hellcat, the ZL1 will almost assuredly be faster around a track. Perhaps a more interesting comparison will be between the 2017 ZL1, the latest Corvette Z06 that also boasts 650 ponies, and the 640-horsepower Cadillac CTS-V. It'd be an all-GM battle of brands.
If you've got lots of time on your hands, feel free to peruse the complete ordering guide from www.camaro6.com here ( pdf link). There's more there than just the final power figures for the ZL1's supercharged 6.2-liter V8 inside (do a search for the word 'NEW!' in the document). Let us know what fun little tidbits you find.