how can I convince you?
EDIT: I have several interlaced encoded movies, that look MUCH better using progressive upsampling than interlaced upsampling.
also, I claim that motion adaptive upsampling of real interlaced content looks better than plain interlaced upsampling.
According the this page, the chroma sampling points are located in the SAME spatial position for interlaced and progressive YUV 4:2:0:
http://www.mir.com/DMG/chroma.html