Yup, here you are side by side comparison.
MG Exia (left) vs Metail Build Exia (right)
Some random poses...
Proportion (when compared to MG)Head - GN strips a little thinner.
Torso - smaller body, thinner pilot hatch and + vents makes the Green GN globe bigger in proportion.
Shoulders - smaller, sleeker
Arms - some minor colour difference; smaller hands
Hip - smaller skirts,
Thighs - larger GN strips and longer in proportion.
Knee caps - added depths/ panel lines. overall sleeker knee caps
lower legs - shorter ;
Feet - ~ 40% smaller.
Tamashii made a lot of changes on the proportion, I think Metal Build made MG looks out of date.
Articulations (when compared to MG)Head - 2 joints movement (improved down-look)
Torso - no side to side vertical rotation around the GN drive. But bends a lot better front to back
Arms - identical only with swapping hands
Hip - no internal rotation for legs (but compensate with smaller skirts)
Legs - identical
ANKLES - you gonna love this... very strong.
You will miss the torso side rotation on MG sometimes, But the ankles are one hell of an improvement.
Colour (when compared to MG)White - a hint of blue (cold white for graphic designers)
Yellow - orange yellow
Blue - a hint of purple
Red - identical
Strong and vibrant colours
Till then, Ciao~
p/s: if you want it, better buy it now... before it gets expensive like Metal Build 00 seven sword .