I have a PMW-200 and the default format is UDF. When i first started shooting with the camera i notice there was an aliasing effect to the film. I tried changing several settings and it always seemed to be there, especially worse during movement. I changed the format to FAT and noticed a huge improvement and the footage seems to be clearer and more crisp. From everything i am reading, it would seem UDF is supposed to be a better format.
"•4. is an acceptable broadcast format whereas 35Mbits@4:2:0 is not."
4.2.0 format has been used in broadcasting for a long time and is still a broadcast format. The electronic TV signal is still transmitted in 4.2.0 format and will continue to. Just because some producers in TV stations made the choice that they want their footage only in 4.2.2 is NOT because this is the only broadcast format. The majority of the ENG footage is still shot in 4.2.0 format so it's not entirely true what you state in relation to point 4. Also, TV stations' policies do not state the 4.2.2 sampling is the ONLY broadcast format acceptable.
I never said 4:2:2 was the only accepted broadcast format but that it is an accepted one. Please don't put words in my mouth. What formats local TV stations accept and what they don't is their business. It's the networks that don't like 4:2:0. All you have to do is read the broadcast standards and practices pages for each of them to see it. This Is one of the reasons companies like Sony and Canon have started offering 50Mbits per sec. 4:2:2 recording on their lower priced cameras in the first place. They even state the broadcast reason in their ads.