if you can capture the hd uncompressed or straight to the image sequence, your quality should be very good. you will, however, need a fast drive array to capture 1080 uncompressed and a capture device that supports uncompressed capture.
is the 1080 d5 tape interlaced (24p with a pulldown)? if so, you would like to remove the pulldown before creating the image sequence. you may be able to do this at capture or you may have to do it in another piece of software (ae can do this easily).
if you are having someone else do the capture, make sure they can capture hd uncompressed. and, if your tape has a pulldown added, ask if they can remove that too.
Kevin Camp
Designer – KCPQ, KMYQ & KRCW