( Camera is a Sony HXRNX5U )
What are your Sequence settings?
Are you certain that they exactly match your footage?
...common format for viewing (e.g. H.264, MPEG2, FLV, etc),
These are all compressed export formats... it might help to
elaborate on exactly what settings you have used in these cases.
Have you tried exporting to something 'lossless'?
If yes, do you still see the artifacts?
How are you viewing your exported video to judge quality?
Have you tried re-importing your exported file into Premiere
for side-by-side comparison with the original footage?
You might post 'before' and 'after' images to illustrate your issue.
Your questions lead me to the answer, I believe. :-)
It turns out that when I created the sequence, I somehow got the frame rate set incorrectly and that's all it was. :-P Of course there are still subtle aliasing artifacts in the video, the normal and expected ones, but the horendous "oscillating" aliasing artifacts that I was seeing in my export files is now gone and the picture looks excellent. :-)