Since nobody mention it here yet, thought i'd do it. Found authentics voyager size megatron on retail yesterday.
seems decent in my eyes, so i pick him up.
This is the best authentics figure so far, IMO. Besides obviously bigger version of the smaller one, it had a bit more improvement.
In tank mode, his head actually folded in.
in robot mode, he looks identical with the smaller one, except with more details. He has additional ankle tilt and waist rotation, so his articulation is the best among all authentics figures.
lastly, size comparison with grimlock.