Some sonys can playback 720p. The only way you can capture it with a Sony deck is to use a capture card Like the Intesity Pro and use the component cables.
The easiest way would be to hire a jvc deck or cam and capture it that way. You will most likely run into the jvc-fcp capture issues. Best to use dvhscap or you will get breaks in your footage.
Peter Brewer
http://www.peterbrewer.net