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The reason for the Sony HDW750 and F900 not having the 720p is that they use traditional video recording, so there would be greater additional costs having 1080p to 720p in camera, compared to the lower cost computer power available today which allows that option in camera. The F900 does cover all the standard frame rates compared to the cheaper more broadcast centred HDW750.
However, if you have 1080p available in camera, I don't know why you'd actually want to shoot 720p. The Varicam, of the same time frame, has the big advantage of the variable frame rate as it's big selling point. The other good factor it had was it had was more a camera issue, the film rec option, which was popular for grading in post and its "look".
I don't think you can compare older designs, which were pushing the boundaries at the time of their design, to modern designs with IT elements that allow changes to formats just by using their firmware and recording the output onto a memory card
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