In the Hemi's defense I think it's a little decieving. The jeep is so quiet and smooth I think it makes it feel slow. I've seen videos of stock hemi WK2s doing 0-60 in under 7 seconds. For a 5,000 pound vehicle to be doing 0 - 60 in the 6 second range is pretty impressive. But it sure doesn't feel like it's going that fast.
I had a Jeep Liberty and my JK Wrangler. Both those vehicles felt like they were going faster because the engines scream and the transmissions kick down very hard. Ironically the Liberty is probably at least 2 seconds slower 0 - 60 and the Wranger is probably 4 seconds slower 0 - 60.
I suspect the ZF 8 speed transmission could knock another full second off the Hemi WK2's 0 - 60 time. If that happens you'll be looking at a 5,000 pound vehicle that does 0 - 60 in under 6 seconds.
But yeah, a supercharger always makes everything better!