Is it me or does anyone see the noticeable size difference

There isn't a huge difference, but there is no doubt GGG is the bigger man don't be silly,

 

ggg and canelo are natural 160 fighters

 

At 5'7.5 ish, Canelo is a lot shorter than GGG. They're both in suits, obviously GGG will look bigger.
Canelo is a fully fledged MW and has been for a long time.

 

Canelo is shorter but more muscular. Height does not equal size, mike tyson was barely 5'10.

 

He's not the lineal MW champ.
Also, you're right. He's not a real MW. He walks around at 190, even a few lbs heavier than Artur Beterbiev.

 

lets see ggg make 154

 

Meanwhile Golovkin fans spent months calling Cotto a coward for ducking Golovkin. Shame. This is why people have a hard time taking Golovkin fans seriously.

 

Maybe Golovkin gives the impression of being much bigger because his head and his face are proportionately larger due to his Korean heritage?

 

Canelo has weighed 172 to 174 on fight night officially as a Light Middle, its been estimated he has weighed over 180 against Cotto and Chavez jr.

But sticking to official fight night weights, Golovkin and Canelo are relatively same weight range.

Golovkin is officially 1.5 inches taller.
I suspect on fight night, Canelo will be the heavier man, Golovkin slightly taller.

 

Sorry but it don't work like that....taller man....but bigger isn't taller.

 

Canelo has bigger hands