I wouldn't be so quick to praise it yet. Shoulders in fighter are better cause of the larger shoulder caps, so it might be masking the problem. The hip section does indeed seem to hold more closely to the fuselage, but really, so does the yf-19, until it gets loose after a few transformations. And I'm noticing a hideous wing-root problem in fighter mode, as well as the knee caps not locking into place either. Possibly mistransformations, but we'll have to see.
One part that is definitely better is the panels that extend up to the head in fighter mode (in front of the shield). The coverage there is much better, so it doesnt leave a giant hole in your fighter.