Perhaps I didn't explained my worries good enough ...
The MP4 or MOV issue is irrelevant when working with rough footage inside - say - Premium Pro CC on iMac. However, as soon as you export media and play back on standard Quick Time player you'll notice slight discrepancies in saturation. The same file imported back into project looks fine when compared on source and project monitors. This is apparently QT Player issue, confirmed by Adobe PP experts as well...
I guess I have to experiment with recording in both formats and rendering output test files in both as well to find out which one QT player is digesting better ...
