What is strange to me is that for a DV sequence, the default resolution for export using QT is 640x480 (Current)... which isn't the "current" right?
And for a AIC 720p sequence, export default is 640x360 (Current)... which isn't the "current" and is smaller than the DV export.
Am I missing something?"
QT Conversion is standard agnostic and doesn't care about FCs sequence setting.
Whatever you import, without regard of size, codec, pixels,etc will be converted to what you set i the export window.