FYI, both CCD and CMOS type chips can have either global or rolling shutter. It's not tied that CMOS is always rolling and CCD always global.
What it comes down to is how fast the sensor can read / reset. This read / rest time is much lower on Mysterium sensor the HD-DSLRs, even lower on Mysterium-X and lower still on Epic. In other words, the effect is utterly negligible.
Graeme
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http://www.nattress.com - Film Effects and Standards Conversion for FCP