The side by side picture, courtesy of Aviation Week (paid subscription required), clearly shows that the aircraft are very similar in size.

What is also clear is that the T-50/PAK-FA is rather more compact in appearance, and would likely be a little bit more difficult to detect visually at range, though it is clearly no F-5.

What is also clear, see the 1990s Northrop/Grumman YF-23 video, is that its fuselage is rather more like that failed ATF competitor than that of the F-22, though the wing and 4-post tail surfaces more closely resemble those of the Raptor.

H/t ELP Defens(c)e Blog for the vid.