Here's an interesting analysis you might be intrigued by – rolling shutter comparisons across a group of 6 Canon and Nikon HDSLR cameras. I don't think there's any major surprise here, but it is an interesting read.
I finally come around to piecing together part of some old tests I did last year. Part of my big DSLRs test, comparing Canon EOS 550D, Canon EOS 7D, Canon EOS 5D Mark II, Canon EOS 1D Mark IV, Nikon D3s and Nikon D300s all with 50mm lens on the body, was rolling shutter. I had the rig with which I could simultaneously record with six cameras so it was perfect for that kind of testing.
Rig for simultaneously recording with six DSLR cameras.
This is the rig I had made from various Manfrotto parts. You can read more about the rig here.
The sample video
(cover photo credit: snap from the blog post)