I think the main difference was that I edited the first nite in Premier CC on a very small laptop...couldn't see very well and I was trying to raise video levels a bit, using a couple different effects, this may have contributed...I did not see any flickering on the raw footage.
The second night footage...my setting was on Landscape (vs standard), but I brought the footage in directly into Avid with broadcast monitor...did very little to effect the video...saw no flickering.
With the X3...bringing footage into AVID was hell...lots of artifacts, flickering...not getting any of this with the X5...yes!
Having said all this, on the second night, I had an older asian gentleman talking to me in broken Chinese while I was flying...and I was totally distracted...he was a nice guy, but my attempt to be empirical in comparing the 2 nights shooting was less than it should have been. I was still at 800 iso - f4 (ish).
All I can say is that I see a huge difference between the 2 cameras...I'm still not sure about the lens calibration thing...have questions out there on threads. I know I can make the X5 look better, but am more than pleased with what I'm seeing.
Just had a thought...I know the flickering has to be something I did in post...I am using the first nite shots in this second video...there is no flickering that I can see with these same shots that were flickering in the first video I edited.