How's the Bokeh between the 2 is one better then the other or are they comparable?
Small differences in bokeh is not something we've ever agonised over, or even bothered comparing (then or now) - but we never saw anything (with either lens) that drew our attention away from what we trying to achieve with a particular image.
For us it was a much more simple process - we wanted more trustworthy focus, so we switched from Canon to Nikon end of 2008. The 24-70 f2.8 was a workhorse lens for us, so we simply bought Nikon G to replace Canon L ...in the process we found we'd bought a much sharper lens. D700 and 24-70 f2.8G make an excellent combination.
I mentioned the Fixation thing because the fact that both our Canon and Nikon 24-70's went to them takes out any variation in manufacturer's individual lens QC.