There's no conclusive evidence for the degree of sexual dimorphism in tyrannosaurs. Actually, the idea that Sue is female is pure conjecture, since there's no way to know for sure. If they followed the general rule among animals alive today, the male was probably bigger, more colorful and more ornamented, but of course this is all speculation for now.
I was wondering because birds of prey emphatically do not follow the general rule Of course, the degree to which a one kilogram aerial predator can be compared to a six-ton terrestrial one is... debatable. How big is the T. rex that supposedly had medullary bone?
Indeed. I could not find any estimations of size for MOR-1125 other that "medium-sized", but according to age estimations it died when 18 years old, while Sue is estimated to have died at 28 years old, so there is probably a good deal of size difference between those two.