The resolution loss is significant though.

Although the BD is sharper than the prints in some areas, the extra resolution on the prints reveals some details not visible on the BD, and that simpy cannot be visible @ 720P (i.e. horizontalish stripes that would end up less than one pixel in height @720P end up becoming a block of colour instead of the stripes that are visible on film)

I'm forever finding fine detail on the print that would be completely lost at 720P, it probably isn't a big deal, but personally I am sticking with UHD resolution so that it isn't lost. I'm a pedantic bugger though.