Some specifics on the particular video, the Z06 was loosing traction on every pull, he couldn't keep the wheels hooked up, i.e. breaking it loose in 2nd and 3rd gear. They had just spent time on a drag strip where the Z06 handled the Hellcat pretty handily and were having traction issues there as well. This is verbatim from the Z06 driver.
As for lap times, the Z06 is going make some waves this spring and summer as more hit the track. Here's the latest from VIR, new track record beating everything, including Porsche 918....