Thx Mach for posting my pics here!
Here are size comparison pics
Size comparison: MP-01 vs MP-10

Size comparison: MP-01, PP01C, MP-10

Quick summary: Some major GOODs and BADs of MP-04 compared to MP-01 or MP-04 with container:
GOODs:
1) Better outlook... with detailed waist design and the LONG arms can be adjusted... with transformable gun which can be stored at the back
2) The most detailed G1 MP container made by TakaraTomy/Hasbro so far
BADs:
1) Lack of mechanic details (non-movable mouth plate, non-shinny eyes, no pipes behind the arms, no communication panels on the forearms, no lighting features inside chest, non-movable flipping plates on the legs, thumb cannot move... only index finger and the other 3 fingers can move as one piece...)
2) Lack of metal parts ... I think over 90% are plastic... only metal parts are found on the feet incl. screws... haha