Well, while I can't answer your question directly, I can definitely tell you that if you are working on a PC then quick time is not really quick... (pardon the pun). Quicktime is still limited to 32bit and so when working with quicktime files, you lose the benefits gained from the 64 bit workflow that is CS5/5.5. Is there a specific reason you HAVE to use quicktime?
There are two steps to encoding to a QuickTime file with Premiere Pro. First, you need to select QuickTime as the Format. Then you need to select a codec to use, since QuickTime is just the container. Go to the Video tab, and in the Video Codec section, select the codec you want to use--there should be a couple of dozen choices there. Selecting "None" will get you an RGB 4:4:4 file, but there are some other choices there as well. You'll have to experiment to find the proper one for your needs.
well i have to just check putting in fcp time line as the footage is from a running project. I would like to check visually what i gain or lose?
will gain some confidence to switch the format by working like this.
for example learning about different codecs could be big thing. as on FCP it is just quick time. .
will do some experiments