Hello,
I have a lot of problems with the preview in adobe premiere pro and quicktime when it comes to color grading. These problems I experienced on different computer running Mac os x and different monitors calibrated or not. The issue is that the footage (h.264 / AVCHD) no matter if it´s from a 5d or a sony a7s looks alway more saturated and more punchy in the preview of premiere then after exporting and opening in quicktime. I think it´s a gamma problem. the thing is when i use magic bullet and the magic bullet looks preview inside premiere, it looks the same then in quicktime. when i